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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 609 · 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. 2.4 + ? = 10
  3. 3.66 + ? = 100
  4. 4.8 + ? = 10
  5. 5.22 + ? = 100
  6. 6.6 + ? = 10
  7. 7.44 + ? = 100
  8. 8.7 + ? = 10
  9. 9.3 + ? = 10
  10. 10.68 + ? = 100
  11. 11.89 + ? = 100
  12. 12.9 + ? = 10
  13. 13.62 + ? = 100
  14. 14.1 + ? = 10
  15. 15.32 + ? = 100
  16. 16.23 + ? = 100
  17. 17.54 + ? = 100
  18. 18.78 + ? = 100
  19. 19.82 + ? = 100
  20. 20.29 + ? = 100
  21. 21.2 + ? = 10
  22. 22.11 + ? = 100
  23. 23.30 + ? = 100
  24. 24.36 + ? = 100
  25. 25.65 + ? = 100
  26. 26.58 + ? = 100
  27. 27.56 + ? = 100
  28. 28.51 + ? = 100
  29. 29.53 + ? = 100
  30. 30.87 + ? = 100
  31. 31.71 + ? = 100
  32. 32.33 + ? = 100
  33. 33.35 + ? = 100
  34. 34.77 + ? = 100
  35. 35.5 + ? = 10
  36. 36.14 + ? = 100
  37. 37.59 + ? = 100
  38. 38.26 + ? = 100
  39. 39.72 + ? = 100
  40. 40.28 + ? = 100

Answer key

  1. 5
  2. 6
  3. 34
  4. 2
  5. 78
  6. 4
  7. 56
  8. 3
  9. 7
  10. 32
  11. 11
  12. 1
  13. 38
  14. 9
  15. 68
  16. 77
  17. 46
  18. 22
  19. 18
  20. 71
  21. 8
  22. 89
  23. 70
  24. 64
  25. 35
  26. 42
  27. 44
  28. 49
  29. 47
  30. 13
  31. 29
  32. 67
  33. 65
  34. 23
  35. 5
  36. 86
  37. 41
  38. 74
  39. 28
  40. 72

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