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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 530 · 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. 1.52 + ? = 100
  2. 2.16 + ? = 100
  3. 3.1 + ? = 10
  4. 4.5 + ? = 10
  5. 5.6 + ? = 10
  6. 6.8 + ? = 10
  7. 7.75 + ? = 100
  8. 8.88 + ? = 100
  9. 9.66 + ? = 100
  10. 10.76 + ? = 100
  11. 11.14 + ? = 100
  12. 12.26 + ? = 100
  13. 13.13 + ? = 100
  14. 14.81 + ? = 100
  15. 15.9 + ? = 10
  16. 16.80 + ? = 100
  17. 17.3 + ? = 10
  18. 18.86 + ? = 100
  19. 19.72 + ? = 100
  20. 20.11 + ? = 100
  21. 21.2 + ? = 10
  22. 22.37 + ? = 100
  23. 23.7 + ? = 10
  24. 24.77 + ? = 100
  25. 25.49 + ? = 100
  26. 26.20 + ? = 100
  27. 27.19 + ? = 100
  28. 28.78 + ? = 100
  29. 29.48 + ? = 100
  30. 30.4 + ? = 10
  31. 31.18 + ? = 100
  32. 32.38 + ? = 100
  33. 33.24 + ? = 100
  34. 34.27 + ? = 100
  35. 35.44 + ? = 100
  36. 36.34 + ? = 100
  37. 37.54 + ? = 100
  38. 38.70 + ? = 100
  39. 39.21 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 48
  2. 84
  3. 9
  4. 5
  5. 4
  6. 2
  7. 25
  8. 12
  9. 34
  10. 24
  11. 86
  12. 74
  13. 87
  14. 19
  15. 1
  16. 20
  17. 7
  18. 14
  19. 28
  20. 89
  21. 8
  22. 63
  23. 3
  24. 23
  25. 51
  26. 80
  27. 81
  28. 22
  29. 52
  30. 6
  31. 82
  32. 62
  33. 76
  34. 73
  35. 56
  36. 66
  37. 46
  38. 30
  39. 79
  40. 21

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