1. Write these numbers as decimals:

 a. 0.6 b. 42.05 c. 5.5 d. 0.056 e. 8000.008 f. 3.29

2. Write true or false for each one:

a. 0.050 is the same as 0.05. TRUE
b. 5.12 has 3 decimal places. FALSE
c. 0.399 is a bigger decimal number than 0.901. FALSE
d. The value of the 8 in 3.78 is eight hundredths. TRUE
e. 2.39 × 100 = 2390. FALSE

3.

4. Calculate

 (a) 3.5 + 4.6 = 8.1 (b) 32.1 + 7.6 = 39.7 (c) 20.6 − 10.68 = 9.92 (d) 0.58 + 6.2 = 6.78 (e) 7.8 − 4.1 = 3.7 (f) 243.9 − 59.36 = 184.54 (g) 162.78 + 6.393 = 169.173 (h) 21.79 -1 0.43 = 11.36 (i) 5.62 − 4.39 + 4.39 = 5.62

5. Calculate:

 (a) 0.8 × 10 = 8 (b) 15.92 × 1000 = 15920 (c) 59.83 ÷100 = 0.5983 (d) 2.6 x100 = 260 (e) 0.16 × 100 = 16 (f) 51.29 ÷100 = 0.5129 (g) 5.27 × 10 = 52.7 (h) 8.5 ÷ 100 = 0.085 (i) 19.32 ÷ 10 = 1.932 (j) 67.8 × 100 = 6780 (k) 27.3 ÷10 = 2.73 (l) 0.8 ÷ 1000 = 0.0008

6.

 (a) Find the sum of 9.4, 7.35 and 0.75. The sum is 17.5 (b) What is 8514.8 less 3851.6? The answer is 4663.2 (c) What is the product of 4.7 and 5.3? The product is 24.91 (d) How many pieces of fence post 13.2 cm long can be cut from a plank of wood 150 cm in length? 11 fence posts could be cut. (e) What is the perimeter of a square of side length 4.6 m? The perimeter is 18.4 metres (f) Find the cost of 25 kg of bananas at \$1.85 per kg. The bananas cost \$46.25

7. Calculate:

 (a) 6.6 x 2.4 = 15.84 (b) 8.65 ÷ 0.5 = 17.3 (c) 0.39 x 5 = 1.95 (d) 2.7 x 6.4 = 17.28 (e) 8.32 ÷ 0.08 = 104 (f) 5.72 = 32.49 (g) 6 x 0.3 + 4 x 0.5 = 3.8 (h) 67.2 ÷ 0.12 = 560 (i) 3.12 + 3.22 = 19.85