Page 144 - Mathematics_Std_4

Example 2

−26.5 =18.6

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Steps Solution

1. Subtract decimals: 26.5
5 – 6, it is not sufficient. Take 1 group −18.6
of ones from the 6 ones and change 7.9

into 10. Add decimals:
10 + 5 = 15. Subtract decimals:
15 – 6 = 9. Write 9 in the decimals

place. Remember in tens place 1
tens remains.

2. Subtract whole number:

5 – 8, it is not sufficient. Add
ones: 10 + 5 = 15. Subtract whole
numbers: 15 – 8 = 7. Write 7 in

the ones place. Remember in tens
place, 1 tens remains.

3. Subtract whole numbers: 1 – 1 = 0.

Therefore, −26.5 =18.6 7.9.

Exercise 6

1. 0.8 –0.2 = 2. 0.9 –0.7 =

–
3. 2.4 –0.8 = 4. 3.6 2.8 =
5. 4.7 –0.9 = 6. 22.7 – 4.0 =

137

06/11/2024 17:17:49
MATHEMATICS STD 4 PB 2024.indd 137
MATHEMATICS STD 4 PB 2024.indd 137 06/11/2024 17:17:49