Higher November 2017 Paper 1 Q8
8 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
| \(39 + 33 + 13 = 85 \qquad (40 + 30 + 10 = 80)\) | M0 |
| Beware 82 from incorrect values, eg \(39 + 24 + 19 = 82\) | M0A0 |
| Ignore incorrectly evaluated trials that do not solely lead to the answer |