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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 220 · 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. 1.74 + ? = 100
  2. 2.55 + ? = 100
  3. 3.45 + ? = 100
  4. 4.2 + ? = 10
  5. 5.4 + ? = 10
  6. 6.65 + ? = 100
  7. 7.16 + ? = 100
  8. 8.53 + ? = 100
  9. 9.7 + ? = 10
  10. 10.1 + ? = 10
  11. 11.19 + ? = 100
  12. 12.40 + ? = 100
  13. 13.57 + ? = 100
  14. 14.58 + ? = 100
  15. 15.5 + ? = 10
  16. 16.68 + ? = 100
  17. 17.87 + ? = 100
  18. 18.63 + ? = 100
  19. 19.25 + ? = 100
  20. 20.36 + ? = 100
  21. 21.8 + ? = 10
  22. 22.59 + ? = 100
  23. 23.28 + ? = 100
  24. 24.6 + ? = 10
  25. 25.29 + ? = 100
  26. 26.43 + ? = 100
  27. 27.49 + ? = 100
  28. 28.44 + ? = 100
  29. 29.52 + ? = 100
  30. 30.85 + ? = 100
  31. 31.13 + ? = 100
  32. 32.12 + ? = 100
  33. 33.9 + ? = 10
  34. 34.71 + ? = 100
  35. 35.89 + ? = 100
  36. 36.14 + ? = 100
  37. 37.27 + ? = 100
  38. 38.23 + ? = 100
  39. 39.33 + ? = 100
  40. 40.2 + ? = 10

Answer key

  1. 26
  2. 45
  3. 55
  4. 8
  5. 6
  6. 35
  7. 84
  8. 47
  9. 3
  10. 9
  11. 81
  12. 60
  13. 43
  14. 42
  15. 5
  16. 32
  17. 13
  18. 37
  19. 75
  20. 64
  21. 2
  22. 41
  23. 72
  24. 4
  25. 71
  26. 57
  27. 51
  28. 56
  29. 48
  30. 15
  31. 87
  32. 88
  33. 1
  34. 29
  35. 11
  36. 86
  37. 73
  38. 77
  39. 67
  40. 8

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