Page 108 - Start Up Mathematics_5
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2. Find the following products.
(a) 8.37 × 4 (b) 0.063 × 2 (c) 15.49 × 8 (d) 1.076 × 11
(e) 6 × 4.5 (f) 9 × 13.08 (g) 22.3 × 7.5 (h) 60.05 × 13.7
(i) 93.12 × 8.41 (j) 5.264 × 8.9 (k) 168.27 × 3.6 (l) 31.29 × 8.7
3. Fill in the blanks.
(a) 83.15 × 10 = _________ (b) 6.0023 × 100 = _________
(c) 122.75 × 10 = _________ (d) 9.3847 × 1,000 = _________
(e) 76.632 × 100 = _________ (f) 45.086 × 1,000 = _________
(g) 9.534 × 10 = _________ (h) 89.7049 × 100 = _________
4. Multiply.
(a) 41.6 × 2.3 × 7 (b) 6.81 × 7.04 × 10 (c) 21.9 × 6.52 × 4.1
(d) 92.34 × 3.5 × 6 × 8.2 (e) 100 × 74.681 × 5.3 (f) 7.98 × 3.24 × 6.5
Division
Division by a whole number
Division of decimal numbers is similar to that of whole numbers with a difference that the
decimal point is placed appropriately as it is clear from the steps given in the following example.
Example 11: Divide 12.5 by 5.
.
Solution: 5 1 2 . 5 Step 1: Place the decimal point of the quotient just above
the decimal point of the dividend.
2 . 5 Step 2: Now divide like whole numbers.
5 1 2 . 5
– 1 0 ↓
2 5
– 2 5
0 So, 12.5 ÷ 5 = 2.5
Example 12: Find 1.762 ÷ 2.
0 . 8 8 1 Maths Fun
Solution: 2 1 . 7 6 2
– 0 ↓ What mathematical symbol
1 7 can be put between 6
– 1 6 and 9, to get a number
bigger than 6 and
1 6 smaller than 9?
– 1 6
0 2
– 2
0 So, 1.762 ÷ 2 = 0.881
100