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# Key Stage 1

**Question 1.** The sum of two numbers is 19 and the difference of these two numbers is 3.

- What are the two numbers? Is it a unique solution? Why?

**Question 2.** The sum of two numbers is 28 and the difference of these two numbers is 2.

- What are the two numbers? Is it a unique solution? Why?

**Question 3.** I have 32 red socks. How many pairs of red socks do I have?

**Question 4**. I have 27 blue socks. How many pairs of blue socks do I have? What do you notice?

**Question 5**. If I had 75 green socks would I have any left over after I have put the green socks in pairs?

- What about 60 socks? 101 socks? Any left over after you have put them in pairs? How do you know?

**Question 6. **An apple and an orange costs 39p altogether. What could the cost of the apple and orange be? Work out 4 possible answers.

- The cost of the apple is an odd number. The cost of orange is an even number. Give two possible pairs of answers for the cost of the apple and orange.

**Question 7.** An apple and an orange costs 56p altogether. What could the cost of the apple and orange be? Work out 4 possible answers.

- The cost of the apple is an odd number. The cost of orange is an odd number. Give two possible pairs of answers for the cost of the apple and orange.