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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 139 · 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. 1.9 + ? = 10
  2. 2.7 + ? = 10
  3. 3.3 + ? = 10
  4. 4.84 + ? = 100
  5. 5.73 + ? = 100
  6. 6.6 + ? = 10
  7. 7.58 + ? = 100
  8. 8.28 + ? = 100
  9. 9.70 + ? = 100
  10. 10.15 + ? = 100
  11. 11.46 + ? = 100
  12. 12.33 + ? = 100
  13. 13.2 + ? = 10
  14. 14.4 + ? = 10
  15. 15.26 + ? = 100
  16. 16.38 + ? = 100
  17. 17.1 + ? = 10
  18. 18.49 + ? = 100
  19. 19.39 + ? = 100
  20. 20.63 + ? = 100
  21. 21.45 + ? = 100
  22. 22.83 + ? = 100
  23. 23.75 + ? = 100
  24. 24.65 + ? = 100
  25. 25.17 + ? = 100
  26. 26.35 + ? = 100
  27. 27.79 + ? = 100
  28. 28.52 + ? = 100
  29. 29.61 + ? = 100
  30. 30.8 + ? = 10
  31. 31.51 + ? = 100
  32. 32.5 + ? = 10
  33. 33.22 + ? = 100
  34. 34.37 + ? = 100
  35. 35.19 + ? = 100
  36. 36.89 + ? = 100
  37. 37.21 + ? = 100
  38. 38.57 + ? = 100
  39. 39.50 + ? = 100
  40. 40.12 + ? = 100

Answer key

  1. 1
  2. 3
  3. 7
  4. 16
  5. 27
  6. 4
  7. 42
  8. 72
  9. 30
  10. 85
  11. 54
  12. 67
  13. 8
  14. 6
  15. 74
  16. 62
  17. 9
  18. 51
  19. 61
  20. 37
  21. 55
  22. 17
  23. 25
  24. 35
  25. 83
  26. 65
  27. 21
  28. 48
  29. 39
  30. 2
  31. 49
  32. 5
  33. 78
  34. 63
  35. 81
  36. 11
  37. 79
  38. 43
  39. 50
  40. 88

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