Foundation November 2023 Paper 2 Q9
9 Connor is estimating the answer to \(\quad 385 + 1479\)
(a) He rounds each number to the nearest 10
Work out his estimate. [2 marks]
(b) Connor says,
“My estimate will be more than the exact answer.”
How does he know this without working out the exact answer? [1 mark]
| Answer | Mark | Comments |
|---|---|---|
| 390 or 1480 | M1 | |
| 1870 | A1 |
Additional guidance
| Answer only | M1A1 |
| Ignore calculation of 1864 but 1870 only coming from incorrect rounding of 1864 is M0 |
| Answer | Mark | Comments |
|---|---|---|
| Valid explanation referring to both of the original numbers being rounded up | B1 | eg he rounded each number up or each rounded number is bigger than the actual number or 390 is bigger than 385 and 1480 is bigger than 1479 |
Additional guidance
| Ignore irrelevant, non-contradictory statements | |
| Ignore 1864 alongside a correct explanation | |
| Incorrect rounding or values seen in this part even alongside a correct explanation | B0 |
| The numbers are rounded up (to the nearest 10) | B1 |
| 385 became 390 and 1479 became 1480 | B1 |
| One number increased 5 and the other 1 (so it will be 6 bigger) | B1 |
| 385 became 390 and 1479 became 1500 | B0 |
| The numbers are rounded to the nearest 10 | B0 |
| It’s rounding so the answer is bigger | B0 |
| 1870 is bigger than 1864 | B0 |