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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 421 · 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. 2.22 + ? = 100
  3. 3.4 + ? = 10
  4. 4.1 + ? = 10
  5. 5.56 + ? = 100
  6. 6.9 + ? = 10
  7. 7.6 + ? = 10
  8. 8.49 + ? = 100
  9. 9.19 + ? = 100
  10. 10.51 + ? = 100
  11. 11.8 + ? = 10
  12. 12.57 + ? = 100
  13. 13.88 + ? = 100
  14. 14.2 + ? = 10
  15. 15.33 + ? = 100
  16. 16.3 + ? = 10
  17. 17.81 + ? = 100
  18. 18.60 + ? = 100
  19. 19.64 + ? = 100
  20. 20.52 + ? = 100
  21. 21.7 + ? = 10
  22. 22.13 + ? = 100
  23. 23.65 + ? = 100
  24. 24.34 + ? = 100
  25. 25.37 + ? = 100
  26. 26.11 + ? = 100
  27. 27.48 + ? = 100
  28. 28.17 + ? = 100
  29. 29.70 + ? = 100
  30. 30.16 + ? = 100
  31. 31.43 + ? = 100
  32. 32.23 + ? = 100
  33. 33.83 + ? = 100
  34. 34.39 + ? = 100
  35. 35.36 + ? = 100
  36. 36.76 + ? = 100
  37. 37.12 + ? = 100
  38. 38.44 + ? = 100
  39. 39.21 + ? = 100
  40. 40.58 + ? = 100

Answer key

  1. 5
  2. 78
  3. 6
  4. 9
  5. 44
  6. 1
  7. 4
  8. 51
  9. 81
  10. 49
  11. 2
  12. 43
  13. 12
  14. 8
  15. 67
  16. 7
  17. 19
  18. 40
  19. 36
  20. 48
  21. 3
  22. 87
  23. 35
  24. 66
  25. 63
  26. 89
  27. 52
  28. 83
  29. 30
  30. 84
  31. 57
  32. 77
  33. 17
  34. 61
  35. 64
  36. 24
  37. 88
  38. 56
  39. 79
  40. 42

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