Page 57 - ICSE Math 5

(e) A group of tourists needs rental cars to go around the city. There are 239 tourists in
the group. If each rental car can carry 4 tourists, estimate the number of rental cars
the group will need.
3. Solve the following word problems.

(a) Ashish has an apple farm. He wants to sell the apples in the market. If he packs 35
apples in one box, then how many boxes will he need to pack 1,820 apples?
(b) A manufacturer makes paper envelopes from recycled paper and packs them in a
packet. If each packet contains 75 envelopes, how many packets the manufacturer
will need to pack 6,375 such envelopes?

(c) If 9,604 kg of rice is packed in 98 bags, what quantity of rice will each bag contain?
(d) A science fair has 156 projects displayed. If there are 12 projects displayed in each
row, how many rows are there at the science fair?
(e) Mr Sharma asks a builder to construct a boundary outside his house. If there are 1,596
bricks, how many rows of 21 bricks each can be laid for constructing the boundary?

(f) A factory produces 3,750 pencils in 15 days. How many pencils can it produce in 30
days?

4. Frame a word problem for the following. Also, solve to find the quotient.
(a) 2,700  60 (b) 4,970  70 (c) 108  12

(d) 195  15 (e) 432  18 (f) 7,440  24

Solving Problems Using the Four Operations

We know that the four basic operations in mathematics are addition, subtraction, multiplication
and division.
The order in which we solve a problem involving all these operations is given by a rule called
BODMAS. According to the rule, we solve a problem in the given order.

B  Brackets (first) M  Multiplication (fourth)
O  Of (second) A  Addition (fifth)
D  Division (third) S  Subtraction (sixth)

We will learn about the operation ‘Brackets’ in higher classes. Now let’s understand BODMAS
with the help of the following examples.
Example 24: Solve 12 ÷ 3 × 2 + 8 – 3.

Solution: Step 1: Divide 12 by 3. Step 2: Multiply 4 by 2.
12 ÷ 3 = 4 4 × 2 = 8

Thus, 12 ÷ 3 × 2 + 8 – 3 Thus, 4 × 2 + 8 – 3 = 8 + 8 – 3.
= 4 × 2 + 8 – 3.
Step 3: Add 8 and 8. Step 4: Subtract 3 from 16.

8 + 8 = 16 16 – 3 = 13
Thus, 8 + 8 – 3 = 16 – 3. So, 12  3 × 2 + 8 – 3 = 13.

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