Rounding, estimating and adding decimals
Answers are for parents and teachers.
1
Round 9.375 to the nearest whole number, tenth and hundredth.
9; 9.4; 9.38.
2
A number rounded to the nearest tenth is 4.6. What is the smallest and the greatest decimal with two places it could be?
Smallest 4.55 and greatest 4.64.
3
Estimate 27.4 + 15.85 by rounding to whole numbers, then add exactly.
Estimate 27 + 16 = 43. Exact 27.40 + 15.85 = 43.25.
4
Youssef buys 3.75 L of milk, 2.5 L of juice and 1.25 L of water. How many litres does he buy?
3.75 + 2.50 + 1.25 = 7.5 L.
5
Add 6.45 + 0.875 and check your answer with an estimate.
6.450 + 0.875 = 7.325. Estimate: 6 + 1 = 7, which is close.