Do this exercise without using a calculator 
1. Write true or false for each one:
a. 0.9 is the same as 0.90
b. 5.123 has 3 decimal places
c. 0.31 is a bigger decimal number than 0.309
d. The value of the 8 in 3.78 is eight tenths.
e. 1.239 × 100 = 1239
2. Calculate
|
a. 4.6 + 5.6 |
d. 12.2 + 3.6 |
g. 10.2 − 9.65 |
|
b. 0.56 + 5.3 |
e. 9.6 − 2.3 |
h. 248.9 -89.452 |
|
c. 132.76 + 5.324 |
f. 1.79 − 0.41 |
i. 4.52 − 2.34 + 4.39 |
3. Calculate:
|
a. 0.7 × 10 |
e. 5.61 × 100 |
i. 48.72 ÷100 |
|
b. 1.3 x1000 |
f. 0.6 × 1000 |
j. 41.28 ÷10 |
|
c. 3.17 × 10 |
g. 4.5 ÷ 100 |
k. 18.32 ÷ 100 |
|
d. 61.7 × 100 |
h. 16.2 ÷10 |
l. 0.6 ÷ 1000 |
4. a. Find the sum of 8.3, 6.45 and 0.62
b. What is 4512.7 less 2861.5 ?
c. What is the product of 3.7 and 8.2 ?
d. How many pieces of wood 11.2 cm long can be cut from a plank of wood 134.4 cm in length ?
e. What is the perimeter of a square of side length 3.6 m ?
f. Find the cost of 15 kg of bananas at $1.65 per kg .
5. Calculate:
|
a. 4.5 x 2.3 |
d. 3.45 ÷ 0.5 |
|
b. 2.6 x 5.4 |
e. 5.32 ÷ 0.04 |
|
c. 5 x 0.2 + 3 x 0.4 |
f. 56.4 ÷ 0.12 |
