Question

EXERCISE 1E
Estimate each of the following products by rounding off each number to the nearest ten:
1. 38 x 63
2. 54 x 47
3. 28 x 63
4. 42 x 75
5. 64 x 58
6. 15 x 34​

Answer 1

38 is rounded off to the nearest tens=40

63 is rounded off to the nearest tens=60

Estimate product= 40×60=2400

Actual product=38×63=2394

And same as others.

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Answer 2

Answer:

Here is your answer

Step-by-step explanation:

1. 38 round off - 40, 63 round off - 60

40 × 60 = 2400

2. 54 = 50, 47 = 50

50 × 50 = 2500

3. 28 = 30, 63 = 60

30 × 60 = 1800

4. 42 = 40, 75 = 80. [ The no with last digit 5 round off will be the next no.]

40 × 80 = 3200

5. 64 = 60, 58 = 60

60 × 60 = 3600

6. 15 = 20, 34 = 30

20 × 30 = 600