Page 49 - Math Genius C5

E:\Working\Orange_Education\Math_Genius_5\Open_Files\CHAP_02
\\October 8, 2025 12:09 PM Bharat Arora P-9 Reader _________________________ Date: ___________________74

( c) rounded to
4465 nearest 1000 4000 estimated product Actual product

rounded to × 4 0 0 0 × 4 4 6 5
8
1 0
8 nearest 10 10 4 0 0 0 0 3 5 7 2 0

The estimated product is close to the actual product.
( d) estimated quotient Actual quotient

24,581 20,000 (Rounding off to the nearest ten thousand) 5 7 1
2 4 5 8 1
43 40 (Rounding off to the nearest ten) 43 2 1 5
20,000 ÷ 40 = 500 3 0 8
3 0 1
7 1

The estimated quotient is close to the actual quotient. 4 3
28

Think Tank Logical Thinking
Ask your parents’ monthly income and estimate their yearly income. What is the
difference between their actual and estimated yearly incomes?

Practice time 2E

1. estimate the value of:

( a) 31,972 + 10,322 (b) 2575 × 124 (c) 7,21,994 – 66,159 (d) 2,56,311 ÷ 578
2. the table given below shows how much Varun spent on some items.

Item Amount in (`)

New car 6,29,575
Washing machine 28,675

Mobile phone 36,435

Earphones 3970

Round off each amount to the nearest thousand and estimate:

( a) total amount spent on the washing machine and mobile phone.

( b) the difference of the costs of the washing machine and the earphones.

( c) total amount spent by Varun.
3. Find the estimated quotient of 3,25,870 and 5543.

4. Find the actual sum and the estimated sum of 4,83,479 and 5,67,891 by rounding off
to the nearest 10,000.

Mathematics-5
Mathematics-5 4747