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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 67 · 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. 1.3 + ? = 10
  2. 2.9 + ? = 10
  3. 3.16 + ? = 100
  4. 4.1 + ? = 10
  5. 5.15 + ? = 100
  6. 6.67 + ? = 100
  7. 7.82 + ? = 100
  8. 8.6 + ? = 10
  9. 9.13 + ? = 100
  10. 10.28 + ? = 100
  11. 11.2 + ? = 10
  12. 12.81 + ? = 100
  13. 13.4 + ? = 10
  14. 14.79 + ? = 100
  15. 15.58 + ? = 100
  16. 16.12 + ? = 100
  17. 17.7 + ? = 10
  18. 18.5 + ? = 10
  19. 19.74 + ? = 100
  20. 20.80 + ? = 100
  21. 21.41 + ? = 100
  22. 22.48 + ? = 100
  23. 23.20 + ? = 100
  24. 24.84 + ? = 100
  25. 25.31 + ? = 100
  26. 26.27 + ? = 100
  27. 27.69 + ? = 100
  28. 28.37 + ? = 100
  29. 29.29 + ? = 100
  30. 30.85 + ? = 100
  31. 31.38 + ? = 100
  32. 32.18 + ? = 100
  33. 33.76 + ? = 100
  34. 34.34 + ? = 100
  35. 35.8 + ? = 10
  36. 36.32 + ? = 100
  37. 37.62 + ? = 100
  38. 38.26 + ? = 100
  39. 39.86 + ? = 100
  40. 40.77 + ? = 100

Answer key

  1. 7
  2. 1
  3. 84
  4. 9
  5. 85
  6. 33
  7. 18
  8. 4
  9. 87
  10. 72
  11. 8
  12. 19
  13. 6
  14. 21
  15. 42
  16. 88
  17. 3
  18. 5
  19. 26
  20. 20
  21. 59
  22. 52
  23. 80
  24. 16
  25. 69
  26. 73
  27. 31
  28. 63
  29. 71
  30. 15
  31. 62
  32. 82
  33. 24
  34. 66
  35. 2
  36. 68
  37. 38
  38. 74
  39. 14
  40. 23

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