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Number bonds to 20 Mental Mathematics Starters Activity 5 Mathematics Objective Know by heart all addition and subtraction facts for each number to 20. Using this should help you learn: To remember number bonds to 20 so you can quickly answer questions correctly. Target = 15 out of 20 1. Write the missing number: 3+4= 5+=9 2. Write the missing number: 7+4= 6 + = 12 3. Write the missing number: 9 + = 14 15 - = 9 4. Write the missing number: 6+7= -8=9 5. Write the missing number: 6 + = 12 + 7 = 19 6. Write the missing number: + 2 = 11 10 + = 16 7. Write the missing number: 6 + = 19 5+9= 8. Write the missing number: 3 + 14 = 18 - = 7 9. Write the missing number: 13 + 7 = 9 + = 20 10. Write the missing number: 13 + 4 = 13 - = 9 11. Write the missing number: 7+7= 8 + = 19 12. Write the missing number: + 8 = 11 12 + = 20 13. Write the missing number: 17 + = 20 20 - = 9 14. Write the missing number: 15 + 2 = 17 - 9 = 15. Write the missing number: 8+8= 19 + = 19 16. Write the missing number: 2 + 16 = 9 + = 16 17. Write the missing number: 20 + = 20 20 - = 7 18. Write the missing number: 3+4= 5+=9 19. Write the missing number: 3+4= 5+=9 20. Write the missing number: 3+4= 5+=9 Evaluation . . . Did you: Answer at least 15 out of the 20 questions correctly?