Page 136 - New Medley 3 Semester 1

EXERCISE 3.7

A. Estimate the difference by rounding to nearest tens.
1. 6101 – 4848 2. 7572 – 3115
Estimate: – Estimate: –

= =

3. 5136 – 4279 4. 4112 – 3144

Estimate: – Estimate: –

= =

B. An encyclopedia on dogs has 4097 pages. Another encyclopedia on cats
has 2345 pages. Estimate how many pages the encyclopedia on cats has
more than the encyclopedia on dogs by rounding to nearest tens.

C. Estimate the sum by rounding to nearest hundreds.

1. 6451 + 2231 2. 6569 + 3312

Estimate: + Estimate: +
= =

3. 6129 + 4099 4. 7102 + 3209

Estimate: + Estimate: +

= =

D. In the first month a shop sold 6921 items. In the second month it sold
3199 items. Estimate how many items more were sold in the first month

than second month by rounding to nearest hundreds.

E. Estimate the difference by rounding to nearest thousands.
1. 6819 – 3239 2. 7712 – 2549

Estimate: – Estimate: –

= =

3. 5929 – 2209 4. 6849 – 1302
Estimate: – Estimate: –

= =

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