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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 128 · 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. 2.67 + ? = 100
  3. 3.38 + ? = 100
  4. 4.2 + ? = 10
  5. 5.8 + ? = 10
  6. 6.84 + ? = 100
  7. 7.9 + ? = 10
  8. 8.3 + ? = 10
  9. 9.76 + ? = 100
  10. 10.81 + ? = 100
  11. 11.11 + ? = 100
  12. 12.7 + ? = 10
  13. 13.15 + ? = 100
  14. 14.37 + ? = 100
  15. 15.28 + ? = 100
  16. 16.89 + ? = 100
  17. 17.22 + ? = 100
  18. 18.24 + ? = 100
  19. 19.39 + ? = 100
  20. 20.4 + ? = 10
  21. 21.71 + ? = 100
  22. 22.1 + ? = 10
  23. 23.52 + ? = 100
  24. 24.70 + ? = 100
  25. 25.34 + ? = 100
  26. 26.18 + ? = 100
  27. 27.64 + ? = 100
  28. 28.87 + ? = 100
  29. 29.53 + ? = 100
  30. 30.14 + ? = 100
  31. 31.44 + ? = 100
  32. 32.62 + ? = 100
  33. 33.74 + ? = 100
  34. 34.78 + ? = 100
  35. 35.12 + ? = 100
  36. 36.36 + ? = 100
  37. 37.6 + ? = 10
  38. 38.19 + ? = 100
  39. 39.23 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 5
  2. 33
  3. 62
  4. 8
  5. 2
  6. 16
  7. 1
  8. 7
  9. 24
  10. 19
  11. 89
  12. 3
  13. 85
  14. 63
  15. 72
  16. 11
  17. 78
  18. 76
  19. 61
  20. 6
  21. 29
  22. 9
  23. 48
  24. 30
  25. 66
  26. 82
  27. 36
  28. 13
  29. 47
  30. 86
  31. 56
  32. 38
  33. 26
  34. 22
  35. 88
  36. 64
  37. 4
  38. 81
  39. 77
  40. 45

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