Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown.
Level 1 · Warm-up
1 Round 7.83 to one decimal place.
Show worked solution
The next digit is 3, which is under 5, so the answer is 7.8.
2 Round 0.462 to two decimal places.
Show worked solution
Keep 0.46 and look at the 2, which is under 5, so the answer is 0.46.
3 Round 45.678 to the nearest whole number.
Show worked solution
The tenths digit is 6, which is 5 or more, so 45 goes up to 46.
Level 2 · Core
4 Round 12.856 to two decimal places.
Show worked solution
The next digit is 6, so 12.85 rounds up to 12.86.
5 Round 8.649 to one decimal place.
Show worked solution
Keep 8.6 and look at the very next digit, 4. It is under 5, so the answer is 8.6.
6 Round 4826 to the nearest 10.
Show worked solution
The units digit is 6, so the tens digit goes up: 4830.
Level 3 · Challenge
7 Round 9.96 to one decimal place.
Show worked solution
The next digit is 6, so the 9 goes up and carries, and the units 9 carries as well, giving 10.0.
8 A rectangle measures 6.4 cm by 3.7 cm. Find its area, rounded to one decimal place. (number of cm2)
Show worked solution
6.4 × 3.7 = 23.68, and the next digit after 23.6 is 8, so the area is 23.7 cm2.
9 Estimate 38.7 + 21.2 by rounding each number to the nearest whole number first.
Show worked solution
38.7 rounds to 39 and 21.2 rounds to 21, so the estimate is 39 + 21 = 60.