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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 409 · 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. 1.8 + ? = 10
  2. 2.9 + ? = 10
  3. 3.68 + ? = 100
  4. 4.25 + ? = 100
  5. 5.29 + ? = 100
  6. 6.6 + ? = 10
  7. 7.45 + ? = 100
  8. 8.3 + ? = 10
  9. 9.72 + ? = 100
  10. 10.62 + ? = 100
  11. 11.30 + ? = 100
  12. 12.28 + ? = 100
  13. 13.7 + ? = 10
  14. 14.34 + ? = 100
  15. 15.1 + ? = 10
  16. 16.69 + ? = 100
  17. 17.89 + ? = 100
  18. 18.51 + ? = 100
  19. 19.17 + ? = 100
  20. 20.5 + ? = 10
  21. 21.38 + ? = 100
  22. 22.27 + ? = 100
  23. 23.4 + ? = 10
  24. 24.16 + ? = 100
  25. 25.56 + ? = 100
  26. 26.22 + ? = 100
  27. 27.33 + ? = 100
  28. 28.41 + ? = 100
  29. 29.2 + ? = 10
  30. 30.35 + ? = 100
  31. 31.47 + ? = 100
  32. 32.70 + ? = 100
  33. 33.19 + ? = 100
  34. 34.40 + ? = 100
  35. 35.11 + ? = 100
  36. 36.15 + ? = 100
  37. 37.24 + ? = 100
  38. 38.20 + ? = 100
  39. 39.42 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 2
  2. 1
  3. 32
  4. 75
  5. 71
  6. 4
  7. 55
  8. 7
  9. 28
  10. 38
  11. 70
  12. 72
  13. 3
  14. 66
  15. 9
  16. 31
  17. 11
  18. 49
  19. 83
  20. 5
  21. 62
  22. 73
  23. 6
  24. 84
  25. 44
  26. 78
  27. 67
  28. 59
  29. 8
  30. 65
  31. 53
  32. 30
  33. 81
  34. 60
  35. 89
  36. 85
  37. 76
  38. 80
  39. 58
  40. 56

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