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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 51 · 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. 1.8 + ? = 10
  2. 2.1 + ? = 10
  3. 3.38 + ? = 100
  4. 4.21 + ? = 100
  5. 5.6 + ? = 10
  6. 6.5 + ? = 10
  7. 7.7 + ? = 10
  8. 8.25 + ? = 100
  9. 9.2 + ? = 10
  10. 10.16 + ? = 100
  11. 11.9 + ? = 10
  12. 12.3 + ? = 10
  13. 13.86 + ? = 100
  14. 14.68 + ? = 100
  15. 15.30 + ? = 100
  16. 16.41 + ? = 100
  17. 17.62 + ? = 100
  18. 18.72 + ? = 100
  19. 19.18 + ? = 100
  20. 20.23 + ? = 100
  21. 21.31 + ? = 100
  22. 22.17 + ? = 100
  23. 23.52 + ? = 100
  24. 24.64 + ? = 100
  25. 25.69 + ? = 100
  26. 26.70 + ? = 100
  27. 27.87 + ? = 100
  28. 28.39 + ? = 100
  29. 29.73 + ? = 100
  30. 30.54 + ? = 100
  31. 31.33 + ? = 100
  32. 32.24 + ? = 100
  33. 33.4 + ? = 10
  34. 34.82 + ? = 100
  35. 35.35 + ? = 100
  36. 36.45 + ? = 100
  37. 37.29 + ? = 100
  38. 38.26 + ? = 100
  39. 39.80 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 2
  2. 9
  3. 62
  4. 79
  5. 4
  6. 5
  7. 3
  8. 75
  9. 8
  10. 84
  11. 1
  12. 7
  13. 14
  14. 32
  15. 70
  16. 59
  17. 38
  18. 28
  19. 82
  20. 77
  21. 69
  22. 83
  23. 48
  24. 36
  25. 31
  26. 30
  27. 13
  28. 61
  29. 27
  30. 46
  31. 67
  32. 76
  33. 6
  34. 18
  35. 65
  36. 55
  37. 71
  38. 74
  39. 20
  40. 66

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