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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 368 · 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. 1.5 + ? = 10
  2. 2.33 + ? = 100
  3. 3.1 + ? = 10
  4. 4.28 + ? = 100
  5. 5.45 + ? = 100
  6. 6.24 + ? = 100
  7. 7.60 + ? = 100
  8. 8.8 + ? = 10
  9. 9.44 + ? = 100
  10. 10.77 + ? = 100
  11. 11.7 + ? = 10
  12. 12.6 + ? = 10
  13. 13.57 + ? = 100
  14. 14.71 + ? = 100
  15. 15.87 + ? = 100
  16. 16.69 + ? = 100
  17. 17.29 + ? = 100
  18. 18.3 + ? = 10
  19. 19.85 + ? = 100
  20. 20.80 + ? = 100
  21. 21.4 + ? = 10
  22. 22.84 + ? = 100
  23. 23.2 + ? = 10
  24. 24.5 + ? = 10
  25. 25.27 + ? = 100
  26. 26.35 + ? = 100
  27. 27.76 + ? = 100
  28. 28.58 + ? = 100
  29. 29.63 + ? = 100
  30. 30.39 + ? = 100
  31. 31.13 + ? = 100
  32. 32.41 + ? = 100
  33. 33.26 + ? = 100
  34. 34.62 + ? = 100
  35. 35.16 + ? = 100
  36. 36.52 + ? = 100
  37. 37.38 + ? = 100
  38. 38.32 + ? = 100
  39. 39.14 + ? = 100
  40. 40.11 + ? = 100

Answer key

  1. 5
  2. 67
  3. 9
  4. 72
  5. 55
  6. 76
  7. 40
  8. 2
  9. 56
  10. 23
  11. 3
  12. 4
  13. 43
  14. 29
  15. 13
  16. 31
  17. 71
  18. 7
  19. 15
  20. 20
  21. 6
  22. 16
  23. 8
  24. 5
  25. 73
  26. 65
  27. 24
  28. 42
  29. 37
  30. 61
  31. 87
  32. 59
  33. 74
  34. 38
  35. 84
  36. 48
  37. 62
  38. 68
  39. 86
  40. 89

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