Page 272 - ICSE Math 7

Self-Testing Exercise 1

NUMBER SYSTEM

3 9 11 13
1. Arrange , , and in descending order.
7 35 14 28
2. Evaluate the following.

(a) –85 + 670 – (–19) + (–21) (b) –48 – (–175) + 26

3. Find the sum.

–6 –2 1 3
(a) + (b) –2 + 3
19 57 3 5
4. Evaluate the following.

4 2 2 20 5 108 64 1 2 1 1
(a) × ÷ × (b) × ÷ (c) × 4 ÷ 3 × 2
3 6 5 18 4 28 56 3 3 2 4
7 –12
5. By what number should we multiply 36 to get the product as 35 ?

6. Evaluate:
5
9 2
2
8
10
9
0
6
(a) 2 – 6 × 2 (b) 3 ÷ 3 × 3 4 (c) 36 × a × 9 2 (d) 7 × a b
3
4
7
6 3
2 × (3a) 7 × a b
7. Write 0.076500000 in standard form.
n
5
–7
8. Find the value of n, if 2 . 2 = 2 .
9. Simplify the following.
1
1
(a) 3.3 × 0.1 × 24.8 – 5.01 × 0.6 (b) 1 of  1  +  3 −  1 − 1 

 

1.1 × 3.1 0.02 2  2  5  5 6 
10. Express 16.3548 correct to the nearest:
(a) whole number (b) tenth (c) hundredth (d) thousandth
11. Find the cardinal number of the following sets.
2
(a) A = {x | 18 < x < 100, x ∈ N} (b) P = {x | x is a multiple of 5, x < 40}
12. Write all the subsets of {7, 11, 13}.

13. Let A and B be two sets such that A ∪ B has 72 elements, A has 38 elements and A ∩ B has
11 elements. How many elements are there in B?

258