Page 177 - New Medley 4 Semester 1

Estimating Quotient

Example 8: Estimate 243 ÷ 23 by rounding to the nearest tens.

Solution: 243 ÷ 23
= 240 ÷ 20 (Rounding to the nearest tens)

= 24 ÷ 2 (Cancelling one zero each from dividend and divisor)

= 12 [Recall that 12 × 2 = 24]

Example 9: Estimate 4481 ÷ 298 by rounding to the nearest
hundreds.

Solution: 4481 ÷ 298

= 4500 ÷ 300 (Rounding to the nearest hundreds)

= 45 ÷ 3 (Cancelling two zeros each from dividend and divisor)

= 15 [Recall that 15 × 3 = 45]

Example 10: Estimate 7533 ÷ 28 by suitable rounding.

Solution: 7533 ÷ 28

= 7500 ÷ 30 (Rounding 7533 to the nearest hundreds and

28 to the nearest tens)

= 750 ÷ 3 (Cancelling one zero each from dividend and divisor)

= 250 [Recall that 250 × 3 = 750]

EXERCISE 4.7

A. Estimate the following by rounding to the nearest tens.

1. 541 ÷ 62 2. 353 ÷ 73 3. 249 ÷ 48

B. Estimate the following by rounding to the nearest hundreds.

1. 4998 ÷ 516 2. 3587 ÷ 598 3. 6428 ÷ 386

C. Estimate the following by suitable rounding.

1. 2363 ÷ 58 2. 3197 ÷ 76 3. 4814 ÷ 82 4. 7192 ÷ 91

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