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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 81 · 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. 1.48 + ? = 100
  2. 2.23 + ? = 100
  3. 3.65 + ? = 100
  4. 4.54 + ? = 100
  5. 5.52 + ? = 100
  6. 6.2 + ? = 10
  7. 7.9 + ? = 10
  8. 8.64 + ? = 100
  9. 9.4 + ? = 10
  10. 10.31 + ? = 100
  11. 11.53 + ? = 100
  12. 12.79 + ? = 100
  13. 13.5 + ? = 10
  14. 14.40 + ? = 100
  15. 15.8 + ? = 10
  16. 16.44 + ? = 100
  17. 17.7 + ? = 10
  18. 18.12 + ? = 100
  19. 19.6 + ? = 10
  20. 20.47 + ? = 100
  21. 21.25 + ? = 100
  22. 22.74 + ? = 100
  23. 23.3 + ? = 10
  24. 24.80 + ? = 100
  25. 25.72 + ? = 100
  26. 26.1 + ? = 10
  27. 27.21 + ? = 100
  28. 28.57 + ? = 100
  29. 29.88 + ? = 100
  30. 30.45 + ? = 100
  31. 31.51 + ? = 100
  32. 32.16 + ? = 100
  33. 33.84 + ? = 100
  34. 34.29 + ? = 100
  35. 35.49 + ? = 100
  36. 36.86 + ? = 100
  37. 37.13 + ? = 100
  38. 38.36 + ? = 100
  39. 39.78 + ? = 100
  40. 40.28 + ? = 100

Answer key

  1. 52
  2. 77
  3. 35
  4. 46
  5. 48
  6. 8
  7. 1
  8. 36
  9. 6
  10. 69
  11. 47
  12. 21
  13. 5
  14. 60
  15. 2
  16. 56
  17. 3
  18. 88
  19. 4
  20. 53
  21. 75
  22. 26
  23. 7
  24. 20
  25. 28
  26. 9
  27. 79
  28. 43
  29. 12
  30. 55
  31. 49
  32. 84
  33. 16
  34. 71
  35. 51
  36. 14
  37. 87
  38. 64
  39. 22
  40. 72

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