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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 620 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.7 + ? = 10
  2. 2.1 + ? = 10
  3. 3.11 + ? = 100
  4. 4.3 + ? = 10
  5. 5.8 + ? = 10
  6. 6.29 + ? = 100
  7. 7.9 + ? = 10
  8. 8.6 + ? = 10
  9. 9.58 + ? = 100
  10. 10.83 + ? = 100
  11. 11.47 + ? = 100
  12. 12.46 + ? = 100
  13. 13.60 + ? = 100
  14. 14.18 + ? = 100
  15. 15.2 + ? = 10
  16. 16.78 + ? = 100
  17. 17.45 + ? = 100
  18. 18.70 + ? = 100
  19. 19.24 + ? = 100
  20. 20.33 + ? = 100
  21. 21.17 + ? = 100
  22. 22.4 + ? = 10
  23. 23.36 + ? = 100
  24. 24.62 + ? = 100
  25. 25.52 + ? = 100
  26. 26.5 + ? = 10
  27. 27.20 + ? = 100
  28. 28.69 + ? = 100
  29. 29.88 + ? = 100
  30. 30.27 + ? = 100
  31. 31.28 + ? = 100
  32. 32.50 + ? = 100
  33. 33.57 + ? = 100
  34. 34.75 + ? = 100
  35. 35.65 + ? = 100
  36. 36.12 + ? = 100
  37. 37.86 + ? = 100
  38. 38.16 + ? = 100
  39. 39.53 + ? = 100
  40. 40.54 + ? = 100

Answer key

  1. 3
  2. 9
  3. 89
  4. 7
  5. 2
  6. 71
  7. 1
  8. 4
  9. 42
  10. 17
  11. 53
  12. 54
  13. 40
  14. 82
  15. 8
  16. 22
  17. 55
  18. 30
  19. 76
  20. 67
  21. 83
  22. 6
  23. 64
  24. 38
  25. 48
  26. 5
  27. 80
  28. 31
  29. 12
  30. 73
  31. 72
  32. 50
  33. 43
  34. 25
  35. 35
  36. 88
  37. 14
  38. 84
  39. 47
  40. 46

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