Page 154 - New Medley 3 Semester 1

EXERCISE 4.10

A. Estimate the product by rounding to nearest tens.

1. 32 × 28 2. 75 × 16
Estimate: × Estimate: ×

= =

3. 12 × 48 4. 52 × 36

Estimate: × Estimate: ×

= =

B. Each packet has 62 pens. Estimate the number of pens contained in 128
such packets by rounding to nearest tens.

Estimated number of pens is .

THINK AND ANSWER • Logical Reasoning

1. How many hours are there in 12 weeks?

2. There are 50 incense sticks (Agarbatti) in a packet. A bundle contains

12 packets. If 10 bundles are kept in one box, find the number of incense
sticks kept in each box.
3. A crate can hold either 80 oranges or 60 mangoes. A vendor has equal

number of oranges and mangoes in a few crates. Find the least number of
crates that the vendor has. [Hint: Count the number of oranges/mangoes
in 1, 2, 3... crates]

PUZZLE • Critical Thinking

In each of the following. Find the missing numbers by identifying the

operations involved.

1. (a) (b) (c)
2
40 60 200 50
100 150

?
? ?
75 50
901 899

3 4

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