Page 41 - Math Skill - 5

The Four Fundamental Operations 39

Exercise 3.9

1. Simplify the following numerical expressions.
(a) 80 – {16 ÷ (7 – 2 – 1)} (b) [135 ÷ {23 – 2 (8 – 6 – 2)}]

(c) [{(40 – 10 – 6 ÷ 4} × 7 + 3} (d) [40 ÷ {19 – 3 (6 – 4 – 1)}]

(e) 24 + {(6 ÷ 3 – 1) + 5} ÷ 3 of 2 – 3 × 7

ASSESSMENT TIME

COMPETENCY BASED QUESTIONS
A. Multiple-Choice Questions

1. The number larger than 40 + (39 + 1) is:
(a) 49 (b) 80 (c) 83
2. Which of the following expression yields the quotient as a natural number?
(a) 20 ÷ 20 (b) 0 ÷ 20 (c) 1 ÷ 20

3. The least number which is subtracted from 98 and the difference is exactly divisible by 5 is:
a) 0 (b) 1 (c) 3
4. The multiplicative identity for whole number is:

(a) 0 (b) 1 (c) 2
5. If a number is divided by itself, the quotient is always:

(a) 0 (b) 1 (c) number itself
6. A number smaller than 6000 ÷ 6000 is:
(a) 0 (b) 1 (c) 6

7. How many minutes are there in 1500 seconds?
(a) 20 min. (b) 25 min. (c) 30 min.
B. Fill in the Blanks
1. 5,46,432 + 3,87,043 + 1,37,852 = _________ 2. 68,58,837 – 18,85,642 = _________

3. 54,749 × 354 = _________ 4. 2,75,364 ÷ 245 ⇐ Quotient =
5. 90 – [90 – {45 + (45 ÷ 15)}] = _________ Remainder =

SKILL BASED QUESTIONS
C. Case Study
Rajeev works as a packer in a biscuit factory. He packs
about 2485 packets of biscuit in boxes each day. If the
biscuits are packed properly, 490 packets of biscuits can
be packed in a box.