Write your own question
The question
Two whole numbers add up to 20, and one is bigger than the other.
Write a sum-and-difference question of your own about them, and give its answer.
This one has more than one right answer
writea question
required answermust match
9 and 11
9 and 118 and 127 and 136 and 145 and 154 and 163 and 172 and 18
8valid questions
- This time you write the question yourself.
- The question you write must have the exact answer named in the prompt.
- Work backwards: pick something, work out its answer, and keep it if it matches. 9 and 11 works, for instance — but it is not the only one.
- Now list every choice that works. The pairs adding to 20 are 9 and 11; 8 and 12; 7 and 13; 6 and 14; 5 and 15; 4 and 16; 3 and 17 and 2 and 18 — 8 in all.
- So 8 different questions would all be right.
How it works.
- 01
This time you write the question yourself.
- 02
The question you write must have the exact answer named in the prompt.
- 03
Work backwards: pick something, work out its answer, and keep it if it matches. 9 and 11 works, for instance — but it is not the only one.
- 04
Now list every choice that works. The pairs adding to 20 are 9 and 11; 8 and 12; 7 and 13; 6 and 14; 5 and 15; 4 and 16; 3 and 17 and 2 and 18 — 8 in all.
- 05
So 8 different questions would all be right.