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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 26 · 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. 3.19 + ? = 100
  4. 4.47 + ? = 100
  5. 5.8 + ? = 10
  6. 6.11 + ? = 100
  7. 7.2 + ? = 10
  8. 8.5 + ? = 10
  9. 9.82 + ? = 100
  10. 10.77 + ? = 100
  11. 11.76 + ? = 100
  12. 12.4 + ? = 10
  13. 13.51 + ? = 100
  14. 14.69 + ? = 100
  15. 15.53 + ? = 100
  16. 16.9 + ? = 10
  17. 17.80 + ? = 100
  18. 18.86 + ? = 100
  19. 19.30 + ? = 100
  20. 20.36 + ? = 100
  21. 21.87 + ? = 100
  22. 22.35 + ? = 100
  23. 23.67 + ? = 100
  24. 24.26 + ? = 100
  25. 25.21 + ? = 100
  26. 26.52 + ? = 100
  27. 27.66 + ? = 100
  28. 28.43 + ? = 100
  29. 29.89 + ? = 100
  30. 30.16 + ? = 100
  31. 31.59 + ? = 100
  32. 32.62 + ? = 100
  33. 33.31 + ? = 100
  34. 34.33 + ? = 100
  35. 35.34 + ? = 100
  36. 36.6 + ? = 10
  37. 37.3 + ? = 10
  38. 38.39 + ? = 100
  39. 39.22 + ? = 100
  40. 40.83 + ? = 100

Answer key

  1. 3
  2. 9
  3. 81
  4. 53
  5. 2
  6. 89
  7. 8
  8. 5
  9. 18
  10. 23
  11. 24
  12. 6
  13. 49
  14. 31
  15. 47
  16. 1
  17. 20
  18. 14
  19. 70
  20. 64
  21. 13
  22. 65
  23. 33
  24. 74
  25. 79
  26. 48
  27. 34
  28. 57
  29. 11
  30. 84
  31. 41
  32. 38
  33. 69
  34. 67
  35. 66
  36. 4
  37. 7
  38. 61
  39. 78
  40. 17

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