## Grade 4 USA School Math Addition and Subtraction of Time

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Master this topic as part of

*Clock* 3. Addition

4. Subtraction

7. Division

7.4. Long Division

9.1.1. Factors

9.1.1.1. Finding Factors of a Number

9.1.1.2. HCF (Highest Common Factor)

9.1.2. Multiples

9.1.2.1. Finding Multiples of a Number

9.1.2.2. LCM (Lowest Common Multiple)

9.2. Types of Numbers

9.2.1. Odd and Even Numbers

9.2.1.1. Even Numbers

9.2.1.2. Odd Numbers

9.2.2. Prime and Composite Numbers

9.3.1. Test Divisibility by 2

9.3.2. Test Divisibility by 3

9.3.3. Test Divisibility by 5

9.3.4. Test Divisibility by 6

9.3.5. Test Divisibility by 9

9.3.6. Test Divisibility by 10

10. Patterns

11. Rounding Numbers

11.1. Rounding Off Numbers

11.1.1. Rounding Off to the Nearest Ten

11.2. Estimating Sum

11.3. Estimating Difference

11.4. Estimating Products

12. Fractions

12.2.1. Addition of Like Fractions

12.2.2. Subtraction of Like Fractions

12.4. Unit Fraction

12.6. Comparison of Fractions

12.7. Equivalent Fractions

12.9. Fraction as Division

12.10. Division as Fraction

13. Decimals

13.1. Conversions

14. Money

14.1. Introduction to Currency

14.3. Express Money in Figures

14.4. Conversion of Money

14.4.4. Convert Cents into Dollars

14.7. Word Problems on Money

15. Measurement

15.1. Measurement of Length

15.1.2.1. Addition of Lengths

15.1.2.1.1. Addition of Lengths in Meters and Centimeters

15.1.2.1.2. Addition of Lengths in Kilometers and Meters

15.1.2.2. Subtraction of Lengths

15.1.2.2.1. Subtraction of Lengths in Meters and Centimeters

15.1.2.2.2. Subtraction of Lengths in Kilometers and Meters

15.1.3. Word Problems on Length

15.1.3.1. Word Problems on Addition of Lengths

15.1.3.2. Word Problems on Subtraction of Lengths

15.2. Measurement of Weight

15.2.2.1. Addition of Weights

15.2.2.1.1. Addition of Weights in Grams and Milligrams

15.2.2.1.2. Addition of Weights in Kilograms and Grams

15.2.2.2. Subtraction of Weights

15.2.2.2.1. Subtraction of Weights in Grams and Milligrams

15.2.2.2.2. Subtraction of Weights in Kilograms and Grams

15.2.3. Word Problems on Weights

15.2.3.1. Word Problems on Addition of Weights

15.2.3.2. Word Problems on Subtraction of Weights

15.3. Measurement of Capacity

15.3.3. Word Problems on Capacity

15.3.3.1. Word Problems on Addition of Capacity

15.3.3.2. Word Problems on Subtraction of Capacity

16. Unitary Method

17. Geometry

17.2. Using a Ruler

17.4. Types of Lines

17.4.1. Straight and Curved Lines

17.4.3. Open and Closed Shapes

17.5. Polygons

17.5.1. Understanding Polygons

17.5.2. Name the Polygon

17.6. Circle

20. Symmetry

20.1. Introduction to Symmetry

20.3. Symmetry Around Us

20.5. Symmetry in Alphabets

20.6. Symmetry in Numerals

21. Time

21.1. Clock

21.1.2. Measuring Time

21.1.3. 24-Hour Clock Time

21.1.4. Use of 'AM' and 'PM'

21.1.5. Addition and Subtraction of Time

21.2. Calendar

22. Data Handling

22.1. Basic Definition of Data

22.2. Pictographs

22.3. Bar Graphs

22.3.1. Drawing Bar Graphs

22.3.2. Interpreting Bar Graphs