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E:\Working\Focus_Learning\Math_Genius_5_(05-10-2023)\Open_Files\CHAP_05
\\February 16, 2024 2:22 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

example 3: Priyanka bought 8.5 litres of milk for preparing some sweets. 4 2 5 0

The cost of milk was `42.50 per litre. How much amount did she spend × 8 5
2 1 2 5 0
to buy the milk? + 3 4 0 0 0 0
Solution: The cost of 1 L of milk is `42.50. 3 6 1 2 5 0

So, the cost of 8.5 litres of milk

= `(42.50 × 8.5) = `361.250 = `361.25 42.50 × 8.5 = 361.250

Thus, Priyanka spent `361.25 to buy 8.5 litres 2 decimal 1 decimal 3 decimal
of milk. places place places

Practice Time 5E

1. Fill in the blanks.

(a) 0.8 × 10 = ______ (b) 7.6 × 10 = ______ (c) 13.8 × 10 = _____

(d) 15.75 × 10 = ______ (e) 4.567 × 100 = ______ (f) 0.457 × 100 = ______

(g) 6.543 × 1000 = ______ (h) 6.56 × 1000 = _____ (i) 27.006 × 1000 = ______

2. Find the products.
(a) 64.8 × 6 (b) 56.08 × 5 (c) 99.99 × 9 (d) 0.687 × 15

(e) 354.6 × 29 (f) 625.52 × 70 (g) 23.645 × 99 (h) 40.43 × 125

(i) 3.05 × 120 (j) 32.65 × 156 (k) 96.72 × 162 (l) 0.465 × 118
3. Multiply the following.

(a) 1.8 × 0.3 (b) 5.3 × 1.2 (c) 28.6 × 1.6 (d) 200.5 × 2.1

(e) 420.06 × 0.02 (f) 10.081 × 1.2 (g) 1.6 × 0.15 (h) 0.20 × 0.05

4. Sandhya has to buy 4 notebooks and 2 packs of crayons. each notebook costs
`35.50 and each pack of crayons costs `81.50.
(i) How much would the notebooks cost?

(ii) How much she will pay for 2 packs of crayons?

(iii) She gives 500-rupee note to the shopkeeper. What amount will she get return
from the shopkeeper?

5. A ribbon costs `12.50 per metre. Sanjana buys 8.5 metres of ribbon. How much does
she pay for ribbon?

teacher’s
tip Discuss with the children with examples that during multiplication, if there are not sufficient numbers of
digits (places), while moving the decimal points towards the right, we can put zero at the extreme right end
of the decimal number to fill the gap.

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