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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 59 · 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. 2.1 + ? = 10
  3. 3.5 + ? = 10
  4. 4.7 + ? = 10
  5. 5.42 + ? = 100
  6. 6.6 + ? = 10
  7. 7.27 + ? = 100
  8. 8.3 + ? = 10
  9. 9.54 + ? = 100
  10. 10.58 + ? = 100
  11. 11.88 + ? = 100
  12. 12.49 + ? = 100
  13. 13.29 + ? = 100
  14. 14.46 + ? = 100
  15. 15.73 + ? = 100
  16. 16.9 + ? = 10
  17. 17.8 + ? = 10
  18. 18.63 + ? = 100
  19. 19.22 + ? = 100
  20. 20.43 + ? = 100
  21. 21.4 + ? = 10
  22. 22.18 + ? = 100
  23. 23.62 + ? = 100
  24. 24.19 + ? = 100
  25. 25.57 + ? = 100
  26. 26.11 + ? = 100
  27. 27.12 + ? = 100
  28. 28.66 + ? = 100
  29. 29.78 + ? = 100
  30. 30.72 + ? = 100
  31. 31.51 + ? = 100
  32. 32.87 + ? = 100
  33. 33.26 + ? = 100
  34. 34.47 + ? = 100
  35. 35.41 + ? = 100
  36. 36.13 + ? = 100
  37. 37.60 + ? = 100
  38. 38.69 + ? = 100
  39. 39.28 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 8
  2. 9
  3. 5
  4. 3
  5. 58
  6. 4
  7. 73
  8. 7
  9. 46
  10. 42
  11. 12
  12. 51
  13. 71
  14. 54
  15. 27
  16. 1
  17. 2
  18. 37
  19. 78
  20. 57
  21. 6
  22. 82
  23. 38
  24. 81
  25. 43
  26. 89
  27. 88
  28. 34
  29. 22
  30. 28
  31. 49
  32. 13
  33. 74
  34. 53
  35. 59
  36. 87
  37. 40
  38. 31
  39. 72
  40. 45

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