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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 170 · 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. 1.2 + ? = 10
  2. 2.57 + ? = 100
  3. 3.5 + ? = 10
  4. 4.9 + ? = 10
  5. 5.4 + ? = 10
  6. 6.40 + ? = 100
  7. 7.17 + ? = 100
  8. 8.87 + ? = 100
  9. 9.74 + ? = 100
  10. 10.23 + ? = 100
  11. 11.18 + ? = 100
  12. 12.80 + ? = 100
  13. 13.1 + ? = 10
  14. 14.86 + ? = 100
  15. 15.3 + ? = 10
  16. 16.8 + ? = 10
  17. 17.32 + ? = 100
  18. 18.13 + ? = 100
  19. 19.6 + ? = 10
  20. 20.48 + ? = 100
  21. 21.44 + ? = 100
  22. 22.29 + ? = 100
  23. 23.89 + ? = 100
  24. 24.25 + ? = 100
  25. 25.33 + ? = 100
  26. 26.56 + ? = 100
  27. 27.11 + ? = 100
  28. 28.15 + ? = 100
  29. 29.76 + ? = 100
  30. 30.65 + ? = 100
  31. 31.7 + ? = 10
  32. 32.28 + ? = 100
  33. 33.54 + ? = 100
  34. 34.26 + ? = 100
  35. 35.51 + ? = 100
  36. 36.47 + ? = 100
  37. 37.16 + ? = 100
  38. 38.50 + ? = 100
  39. 39.30 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 8
  2. 43
  3. 5
  4. 1
  5. 6
  6. 60
  7. 83
  8. 13
  9. 26
  10. 77
  11. 82
  12. 20
  13. 9
  14. 14
  15. 7
  16. 2
  17. 68
  18. 87
  19. 4
  20. 52
  21. 56
  22. 71
  23. 11
  24. 75
  25. 67
  26. 44
  27. 89
  28. 85
  29. 24
  30. 35
  31. 3
  32. 72
  33. 46
  34. 74
  35. 49
  36. 53
  37. 84
  38. 50
  39. 70
  40. 22

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