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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 175 · 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. 1.56 + ? = 100
  2. 2.40 + ? = 100
  3. 3.2 + ? = 10
  4. 4.7 + ? = 10
  5. 5.5 + ? = 10
  6. 6.36 + ? = 100
  7. 7.16 + ? = 100
  8. 8.68 + ? = 100
  9. 9.54 + ? = 100
  10. 10.13 + ? = 100
  11. 11.60 + ? = 100
  12. 12.6 + ? = 10
  13. 13.1 + ? = 10
  14. 14.12 + ? = 100
  15. 15.67 + ? = 100
  16. 16.8 + ? = 10
  17. 17.73 + ? = 100
  18. 18.53 + ? = 100
  19. 19.39 + ? = 100
  20. 20.79 + ? = 100
  21. 21.9 + ? = 10
  22. 22.59 + ? = 100
  23. 23.3 + ? = 10
  24. 24.41 + ? = 100
  25. 25.23 + ? = 100
  26. 26.47 + ? = 100
  27. 27.49 + ? = 100
  28. 28.26 + ? = 100
  29. 29.29 + ? = 100
  30. 30.89 + ? = 100
  31. 31.50 + ? = 100
  32. 32.80 + ? = 100
  33. 33.78 + ? = 100
  34. 34.30 + ? = 100
  35. 35.27 + ? = 100
  36. 36.4 + ? = 10
  37. 37.45 + ? = 100
  38. 38.62 + ? = 100
  39. 39.25 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 44
  2. 60
  3. 8
  4. 3
  5. 5
  6. 64
  7. 84
  8. 32
  9. 46
  10. 87
  11. 40
  12. 4
  13. 9
  14. 88
  15. 33
  16. 2
  17. 27
  18. 47
  19. 61
  20. 21
  21. 1
  22. 41
  23. 7
  24. 59
  25. 77
  26. 53
  27. 51
  28. 74
  29. 71
  30. 11
  31. 50
  32. 20
  33. 22
  34. 70
  35. 73
  36. 6
  37. 55
  38. 38
  39. 75
  40. 16

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