Adding Doubles Minus 1 | Problems, Online Practice, Tests, Worksheets, Quizzes, Assignments | Year 1 | Australian School Math

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Year 1
Addition (1 to 20)
Addition Strategies
Adding Doubles Minus 1

Year 1

1. Number and Algebra,

1.1. Number and place value

1.1.1. Numbers from 1 to 10

1.1.1.1. Counting Numbers from 1 to 10

1.1.1.2. Number Names

1.1.1.3. Comparing Numbers

1.1.1.3.1. By Counting the Number of Objects

1.1.1.3.2. By Counting the Number of Beads on the Abacus

1.1.1.3.3. By Using Number Line

1.1.1.4. Ascending and Descending Order

1.1.1.5. Before, After, and Between

1.1.1.5.1. By Using Number Line

1.1.1.5.2. By Counting Forward and Backward

1.1.1.6. Ordinal Numbers

1.1.1.7. Number Combinations

1.1.1.7.1. To form the Number 1

1.1.1.7.2. To form the Number 2

1.1.1.7.3. To form the Number 3

1.1.1.7.4. To form the Number 4

1.1.1.7.5. To form the Number 5

1.1.1.7.6. To form the Number 6

1.1.1.7.7. To form the Number 7

1.1.1.7.8. To form the Number 8

1.1.1.7.9. To form the Number 9

1.1.1.7.10. To form the Number 10

1.1.2. Numbers from 11 to 20

1.1.2.1. Counting Numbers

1.1.2.2. Number Names

1.1.2.3. Comparing Numbers

1.1.2.3.1. By Counting the Number of Beads on the Abacus

1.1.2.3.2. By Using Number Line

1.1.2.4. Ascending and Descending Order

1.1.2.5. Before, After, and Between

1.1.2.5.1. By Using Number Line

1.1.2.5.2. By Counting Forward and Backward

1.1.3. Numbers from 21 to 100

1.1.3.1. Counting Numbers from 21 to 100

1.1.3.1.1. Counting Numbers from 20 to 29

1.1.3.1.2. Counting Numbers from 30 to 39

1.1.3.1.3. Counting Numbers from 40 to 49

1.1.3.1.4. Counting Numbers from 50 to 59

1.1.3.1.5. Counting Numbers from 60 to 69

1.1.3.1.6. Counting Numbers from 70 to 79

1.1.3.1.7. Counting Numbers from 80 to 89

1.1.3.1.8. Counting Numbers from 90 to 100

1.1.4. Numbers from 1 to 100

1.1.4.1. Counting Numbers

1.1.4.2. Complete the Number Grid from 1 to 100

1.1.4.3. Fill in the Missing Numerals

1.1.4.4. Number and Number Names up to 100

1.1.4.5. Reading Numbers on Abacus

1.1.4.6. Expanded Form

1.1.4.6.1. Numerals in Expanded Form

1.1.4.6.2. Numerals in Short Form

1.1.4.7. Comparing Numbers

1.1.4.7.1. Comparing Numbers Using the Rules of Comparison

1.1.4.7.2. Ascending and Descending Order

1.1.4.7.3. Find the Greatest Number

1.1.4.7.4. Find the Smallest Number

1.1.4.9. Estimate Without Counting to the Nearest Ten

1.1.5. Skip Counting

1.1.5.1. Skip Counting by 2

1.1.5.2. Skip Counting by 3

1.1.5.3. Skip Counting by 4

1.1.5.4. Skip Counting by 5

1.1.5.5. Skip Counting by 6

1.1.5.6. Skip Counting by 7

1.1.5.7. Skip Counting by 8

1.1.5.8. Skip Counting by 9

1.1.5.9. Skip Counting by 10

1.1.6. Recognise model,read, write and order numbers from 1 to 100

1.1.6.1. Comparing numbers from 11-20 on number lines

1.1.6.2. Ascending and Descending Order(11-20)

1.1.6.3. Before, After & Between on number line (11-20)

1.1.6.4. Comparing Numbers on a Number Line(1-100)

1.1.6.5. Before, After & Between on number line (1-100)

1.1.7. Count collections to 100 by partitioning numbers using place values

1.1.7.1. Place Value Models up to 100

1.1.7.2. Identifying the Number at Ones and Tens Place

1.1.7.3. Identifying One-Digit and Two-Digit Numbers

1.1.8. Understanding addition

1.1.8.1. Addition (1 to 20)

1.1.8.1.1. Addition of Two Numbers

1.1.8.1.1.1. Addition by Counting the Number of Objects

1.1.8.1.1.2. Addition by Counting the Number of Lines

1.1.8.1.1.3. Addition by Counting on Fingers

1.1.8.1.1.4. Addition on a Number Line (1 to 10)

1.1.8.1.1.5. Addition on a Number Line (11 to 20)

1.1.8.1.2. Addition of Three Numbers

1.1.8.1.2.1. Addition by Counting the Number of Lines

1.1.8.1.2.2. Addition to Make 10

1.1.8.1.3. Addition Sentences

1.1.8.1.3.1. Write Addition Sentences by Counting the Number of Objects

1.1.8.1.3.2. Identify the Correct Sum

1.1.8.1.3.3. Related Addition Facts

1.1.8.1.4. Add and Compare

1.1.8.1.5. Addition Skill Builder

1.1.8.1.5.1. Adding 1

1.1.8.1.5.2. Adding 2

1.1.8.1.5.3. Adding 3

1.1.8.1.5.4. Adding 4

1.1.8.1.5.5. Adding 5

1.1.8.1.5.6. Adding 6

1.1.8.1.5.7. Adding 7

1.1.8.1.5.8. Adding 8

1.1.8.1.5.9. Adding 9

1.1.8.1.6. Addition of Zero

1.1.8.1.7. Addition Strategies

1.1.8.1.7.1. Adding Doubles

1.1.8.1.7.2. Adding Doubles Plus 1

1.1.8.1.7.3. Adding Doubles Minus 1

1.1.8.1.7.4. Adding 3 Numbers Using Doubles Facts

1.1.8.1.8. Word Problems on Addition

1.1.8.1.9. Addition to Make 20

1.1.8.2. Addition (Upto 100)

1.1.8.2.1. Addition Using Place Value Models

1.1.8.2.2. Column Addition

1.1.8.2.2.1. Add a One-Digit Number to a Two-Digit Number

1.1.8.2.2.1.1. Add a One-Digit Number to a Two-Digit Number (Without Carrying)

1.1.8.2.2.1.2. Add a One-Digit Number to a Two-Digit Number (With Carrying)

1.1.8.2.2.2. Add Two Two-Digit Numbers

1.1.8.2.2.2.1. Add Two Two-Digit Numbers (Without Carrying)

1.1.8.2.2.2.2. Add Two Two-Digit Numbers (With Carrying)

1.1.8.2.2.3. Word Problems: Add Two Two-Digit Numbers

1.1.8.2.2.3.1. Word Problems: Add Two Two-Digit Numbers (Without Carrying)

1.1.8.2.2.3.2. Word Problems: Add Two Two-Digit Numbers (With Carrying)

1.1.9. Understanding subtraction

1.1.9.1. Subtraction (1 to 20)

1.1.9.1.1. Subtraction of Two Numbers

1.1.9.1.1.1. Subtraction by Counting Backwards

1.1.9.1.1.2. Subtraction by Drawing Lines and Crossing Them

1.1.9.1.1.3. Subtraction by Counting the Number of Objects

1.1.9.1.1.4. Subtraction on a Number Line (1 to 10)

1.1.9.1.1.5. Subtraction on a Number Line (11 to 20)

1.1.9.1.1.6. Subtraction by Crossing Out

1.1.9.1.2. Subtraction Sentences

1.1.9.1.2.1. Write Subtraction Sentences by Counting the Number of Objects

1.1.9.1.2.2. Identify Correct Subtraction Sentences

1.1.9.1.2.3. Related Subtraction Facts

1.1.9.1.3. Subtract and Compare

1.1.9.1.4. Subtraction Skill Builder

1.1.9.1.4.1. Subtracting 1

1.1.9.1.4.2. Subtracting 2

1.1.9.1.4.3. Subtracting 3

1.1.9.1.4.4. Subtracting 4

1.1.9.1.4.5. Subtracting 5

1.1.9.1.4.6. Subtracting 6

1.1.9.1.4.7. Subtracting 7

1.1.9.1.4.8. Subtracting 8

1.1.9.1.4.9. Subtracting 9

1.1.9.1.4.10. Subtraction From 10

1.1.9.1.4.11. Subtraction From 20

1.1.9.1.5. Subtraction of Zero

1.1.9.1.6. Subtraction Strategies

1.1.9.1.6.1. Subtracting Doubles

1.1.9.1.6.2. Subtracting Doubles Plus 1

1.1.9.1.6.3. Subtracting Doubles Minus 1

1.1.9.1.7. Word Problems on Subtraction

1.1.9.2. Subtraction (Upto 100)

1.1.9.2.1. Subtraction Using Place Value Models

1.1.9.2.2. Column Subtraction

1.1.9.2.2.1. Subtract a One-Digit Number from a Two-Digit Number

1.1.9.2.2.1.1. Subtract a One-Digit Number from a Two-Digit Number (Without Borrowing)

1.1.9.2.2.1.2. Subtract a One-Digit Number from a Two-Digit Number (With Borrowing)

1.1.9.2.2.2. Subtract Two Two-Digit Numbers

1.1.9.2.2.2.1. Subtract Two Two-Digit Numbers (Without Borrowing)

1.1.9.2.2.2.2. Subtract Two Two-Digit Numbers (With Borrowing)

1.1.9.2.2.3. Word Problems: Subtract Two Two-Digit Numbers

1.1.9.2.2.3.1. Word Problems: Subtract Two Two-Digit Numbers (Without Borrowing)

1.1.9.2.2.3.2. Word Problems: Subtract Two Two-Digit Numbers (With Borrowing)

1.2. Fractions and decimals

1.2.1. Fraction as a Part of a Whole

1.2.2. Fractional Numbers and Fractions

1.2.3. Fractional Part of a Collection

1.3. Money and financial mathematics

1.3.1. Introduction to currency

1.3.2. Coin values

1.3.3. Count money

1.3.4. Compare money amount

1.4. Patterns and algebra

1.4.1. Patterns

1.4.1.1. Introduction to Pattern

1.4.1.2. Pattern in Alphabets

1.4.1.3. Pattern in Shapes

1.4.1.4. Pattern in Numerals

1.4.1.5. Odd One Out

1.4.2. Spatial Understanding

1.4.2.1. Top and Bottom

1.4.2.2. On and Under

1.4.2.3. Above and Below

1.4.2.4. Inside and Outside

1.4.2.5. Left and Right

1.4.2.6. Front and Behind

1.4.2.7. Open and Closed

1.4.2.8. Before and After

2. Measurement and geometry

2.1. Using units of measurement

2.1.1. Identify - Tall or Short

2.1.2. Identify - Long or Short

2.1.3. Measure Using a Ruler

2.1.4. Units of Length

2.1.5. Identify - More or Less

2.1.6. Measure Using a Vessel

2.1.7. Units of Capacity

2.1.8. Identify - Light or Heavy

2.1.9. Measure Using a Weighing Balance

2.1.10. Unit of Weight

2.1.11. Basic Facts About Clocks and Time

2.1.12. Reading Time on the Clock (Interval of an Hour)

2.1.13. Reading Time on the Clock (Minute Hand is at 6)

2.1.14. Days of the Week

2.1.15. Months of the Year

2.1.16. Reading a Calendar

2.1.17. Seasons of the Year

2.2. Shapes

2.2.1. Plane Shapes (2-D shapes)

2.2.1.1. Introduction to Plane Shapes (Rectangle, square, circle, and triangle)

2.2.1.2. Open and Closed Shapes

2.2.1.3. Identify Different Plane Shapes (Rectangle, Square, Circle, and Triangle)

2.2.1.4. Count the Vertices and Sides of a Plane Shape

2.2.1.5. Compare Vertices and Sides of Different Plane Shapes

2.2.1.6. Visualize a Shape After Flipping, Turning and Sliding It

2.2.2. Solid Shapes (3-D shapes)

2.2.2.1. Identify Different Solid Shapes (Cuboid, Cube, Cone, Cylinder, and Sphere)

2.2.2.2. Solid Shapes Around Us

2.2.2.3. Count the Vertices, Edges and Faces of Solid Objects

2.2.2.4. Compare the Vertices, Edges and Faces of Different Solid Objects

2.2.2.5. Identify Sliding and Rolling Objects

3. Statistics and probability

3.1. Chance

3.1.1. More, Less and Equal Likely Events

3.1.2. Certain, Likely, Unlikely, and Impossible Events

3.2. Data representation and interpretation

3.2.1. Counting the Number of Shapes in a Picture

3.2.2. Reading and Interpreting Pictograph

3.2.3. Sorting Data Using Tables

Year 1 Australian School Math Adding Doubles Minus 1

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