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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 659 · 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. 2.8 + ? = 10
  3. 3.28 + ? = 100
  4. 4.71 + ? = 100
  5. 5.47 + ? = 100
  6. 6.67 + ? = 100
  7. 7.86 + ? = 100
  8. 8.2 + ? = 10
  9. 9.12 + ? = 100
  10. 10.89 + ? = 100
  11. 11.41 + ? = 100
  12. 12.7 + ? = 10
  13. 13.6 + ? = 10
  14. 14.88 + ? = 100
  15. 15.3 + ? = 10
  16. 16.34 + ? = 100
  17. 17.74 + ? = 100
  18. 18.31 + ? = 100
  19. 19.23 + ? = 100
  20. 20.75 + ? = 100
  21. 21.84 + ? = 100
  22. 22.63 + ? = 100
  23. 23.20 + ? = 100
  24. 24.25 + ? = 100
  25. 25.68 + ? = 100
  26. 26.1 + ? = 10
  27. 27.48 + ? = 100
  28. 28.64 + ? = 100
  29. 29.29 + ? = 100
  30. 30.65 + ? = 100
  31. 31.38 + ? = 100
  32. 32.43 + ? = 100
  33. 33.85 + ? = 100
  34. 34.55 + ? = 100
  35. 35.40 + ? = 100
  36. 36.78 + ? = 100
  37. 37.11 + ? = 100
  38. 38.59 + ? = 100
  39. 39.54 + ? = 100
  40. 40.4 + ? = 10

Answer key

  1. 5
  2. 2
  3. 72
  4. 29
  5. 53
  6. 33
  7. 14
  8. 8
  9. 88
  10. 11
  11. 59
  12. 3
  13. 4
  14. 12
  15. 7
  16. 66
  17. 26
  18. 69
  19. 77
  20. 25
  21. 16
  22. 37
  23. 80
  24. 75
  25. 32
  26. 9
  27. 52
  28. 36
  29. 71
  30. 35
  31. 62
  32. 57
  33. 15
  34. 45
  35. 60
  36. 22
  37. 89
  38. 41
  39. 46
  40. 6

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