Foundation November 2017 Paper 1 Q24
24 Three whole numbers are each rounded to the nearest 10
The sum of the rounded numbers is 70
Work out the maximum possible sum for the original three numbers. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1 | ||
| Three whole numbers that each are less than 80 and have units digit 4 or States that each number must have units digit 4 | M1 | |
| 82 | A1 | |
| Alternative method 2 | ||
| Correctly evaluated trial for three whole numbers, none of which are a multiple of 10, and that, when rounded, total 70 | M1 | eg \(33 + 33 + 13 = 79\) |
| 82 | A1 | |
Additional guidance
| \(39 + 33 + 13 = 85\) \((40 + 30 + 10 = 80)\) | M0 |
| Beware 82 from incorrect values, eg \(39 + 24 + 19 = 82\) | M0A0 |
| Ignore incorrectly evaluated trials that do not solely lead to the answer |