Year 1 missing number problems test answers to download as PDF

These Year 1 missing number problems test answers give the worked solutions and the marks for every question of the missing number problems test. The test is marked out of 20, so you can work out your score.

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Answer to Question 1 (4 marks)
1. Count on from 4 to 9: 5, 6, 7, 8, 9. That is 5 steps, so the missing number is 5. Check: 4 + 5 = 9. (1 mark)
2. Take 7 away from the total: 12 − 7 = 5. Check: 5 + 7 = 12. (1 mark)
3. 10 take away the missing number leaves 3, so the missing number is 10 − 3 = 7. Check: 10 − 7 = 3. (1 mark)
4. The missing number is the whole: 8 is left after taking 5, so add them back: 8 + 5 = 13. Check: 13 − 5 = 8. (1 mark)
Answer to Question 2 (4 marks)
1. 8 is the whole and 3 is a part. 8 − 3 = 5, so 8 = 3 + 5. (1 mark)
2. 11 is the whole and 6 is a part. 11 − 6 = 5, so 11 = 5 + 6. (1 mark)
3. The same number twice makes 14, so it is a double. Double 7 is 14, so both boxes are 7. (1 mark)
4. Work out the left side: 5 + 4 = 9. The right side must also be 9, and 9 − 3 = 6. So 5 + 4 = 3 + 6. (1 mark)
Answer to Question 3 (4 marks)
1. The long bar at the top shows the whole, which is 16. (1 mark)
2. The part with a number in it under the bar is 9. (1 mark)
3. The known part plus the missing part makes the whole: 9 + ? = 16. (1 mark; 16 − 9 = ? also gets the mark)
4. Count on from 9 to 16: 1 step to 10, then 6 more to 16, that is 7. So the missing part is 7. Check: 9 + 7 = 16. (1 mark)
Answer to Question 4 (4 marks)
1. Sam starts with an unknown number, gets 6 more and has 15: ? + 6 = 15. (1 mark)
2. Take the 6 new cars away from 15: 15 − 6 = 9 cars at the start. (1 mark)
3. Add the 6 cars back to the 9: 9 + 6 = 15, which matches the story, so the answer is right. (1 mark)
4. Sam gives 4 away from his 15 cars: 15 − 4 = 11 cars now. (1 mark)
Answer to Question 5 (4 marks)
1. 18 sweets, some eaten, 11 left: 18 − ? = 11. (1 mark)
2. Count on from 11 to 18: 12, 13, 14, 15, 16, 17, 18. That is 7 steps, so 7 sweets were eaten. (1 mark)
3. Ben puts 5 in: 11 + 5 = 16 sweets in the jar. (1 mark)
4. 16 is less than 18, so there are fewer sweets than at the start. 18 − 16 = 2, so there are 2 fewer. (1 mark)

Total : 20 marks

How to use these Year 1 missing number problems test answers

First, sit the test under timed conditions before you read anything here. Then mark each answer and give yourself the marks shown, including method marks. When you lose marks, read the worked solution and find the step you missed. After that, revise the missing number problems lesson and redo the worksheet.

Also, the Year 1 missing number problems test answers are available as a PDF, so a teacher can mark printed tests quickly. Moreover, all the pages of this chapter work together, so you can move between them at any time. For example, many pupils read the lesson on Monday, practise on Wednesday and test themselves on Friday.