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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 509 · 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. 1.63 + ? = 100
  2. 2.4 + ? = 10
  3. 3.28 + ? = 100
  4. 4.2 + ? = 10
  5. 5.3 + ? = 10
  6. 6.76 + ? = 100
  7. 7.1 + ? = 10
  8. 8.17 + ? = 100
  9. 9.80 + ? = 100
  10. 10.11 + ? = 100
  11. 11.88 + ? = 100
  12. 12.7 + ? = 10
  13. 13.67 + ? = 100
  14. 14.6 + ? = 10
  15. 15.44 + ? = 100
  16. 16.33 + ? = 100
  17. 17.66 + ? = 100
  18. 18.79 + ? = 100
  19. 19.87 + ? = 100
  20. 20.34 + ? = 100
  21. 21.5 + ? = 10
  22. 22.51 + ? = 100
  23. 23.37 + ? = 100
  24. 24.38 + ? = 100
  25. 25.41 + ? = 100
  26. 26.35 + ? = 100
  27. 27.39 + ? = 100
  28. 28.23 + ? = 100
  29. 29.26 + ? = 100
  30. 30.32 + ? = 100
  31. 31.19 + ? = 100
  32. 32.54 + ? = 100
  33. 33.9 + ? = 10
  34. 34.85 + ? = 100
  35. 35.83 + ? = 100
  36. 36.45 + ? = 100
  37. 37.43 + ? = 100
  38. 38.89 + ? = 100
  39. 39.15 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 37
  2. 6
  3. 72
  4. 8
  5. 7
  6. 24
  7. 9
  8. 83
  9. 20
  10. 89
  11. 12
  12. 3
  13. 33
  14. 4
  15. 56
  16. 67
  17. 34
  18. 21
  19. 13
  20. 66
  21. 5
  22. 49
  23. 63
  24. 62
  25. 59
  26. 65
  27. 61
  28. 77
  29. 74
  30. 68
  31. 81
  32. 46
  33. 1
  34. 15
  35. 17
  36. 55
  37. 57
  38. 11
  39. 85
  40. 60

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