Intermediate June 2019 Unit 1 Q5
5. In this question, you must use only the numbers 3 and 7 to make other numbers.
You must only add or subtract.
For example, if we wanted an answer of 11, we could write
\(7 + 7 - 3 = 11.\)
Show how you can get each of the following answers.
(a) 2 [1]
Write your solution in the box below.
= 2
(b) 8 [1]
Write your solution in the box below.
= 8
(c) 19 [1]
Write your solution in the box below.
= 19
| Scheme | Marks | Comments |
|---|---|---|
| Any correct total of 2. e.g. 3 + 3 + 3 − 7 | B1 | B0 if any numbers other than 3 and 7 used. B0 if any operation other than + or – used. e.g. 3 × 3 is not acceptable for 3 + 3 + 3. Allow multi-digit numbers made from 3 or/and 7. e.g. 33, 37, 373 etc. |
| Scheme | Marks | Comments |
|---|---|---|
| Any correct total of 8. e.g. 7 − 3 + 7 − 3 | B1 | B0 if any numbers other than 3 and 7 used. B0 if any operation other than + or – used. e.g. 2 × 7 is not acceptable for 7 + 7. Allow multi-digit numbers made from 3 or/and 7. e.g. 33, 37, 373 etc. |
| Scheme | Marks | Comments |
|---|---|---|
| Any correct total of 19. e.g. 3 + 3 +3 + 3 +7 | B1 | B0 if any numbers other than 3 and 7 used. B0 if any operation other than + or – used. e.g. 4 × 3 is not acceptable for 3 + 3 + 3 + 3. Allow multi-digit numbers made from 3 or/and 7. e.g. 33, 37, 373 etc. |