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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 538 · 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. 1.4 + ? = 10
  2. 2.2 + ? = 10
  3. 3.25 + ? = 100
  4. 4.23 + ? = 100
  5. 5.21 + ? = 100
  6. 6.8 + ? = 10
  7. 7.3 + ? = 10
  8. 8.1 + ? = 10
  9. 9.86 + ? = 100
  10. 10.19 + ? = 100
  11. 11.64 + ? = 100
  12. 12.75 + ? = 100
  13. 13.88 + ? = 100
  14. 14.29 + ? = 100
  15. 15.56 + ? = 100
  16. 16.27 + ? = 100
  17. 17.80 + ? = 100
  18. 18.6 + ? = 10
  19. 19.7 + ? = 10
  20. 20.40 + ? = 100
  21. 21.53 + ? = 100
  22. 22.18 + ? = 100
  23. 23.37 + ? = 100
  24. 24.42 + ? = 100
  25. 25.43 + ? = 100
  26. 26.35 + ? = 100
  27. 27.46 + ? = 100
  28. 28.22 + ? = 100
  29. 29.9 + ? = 10
  30. 30.28 + ? = 100
  31. 31.17 + ? = 100
  32. 32.15 + ? = 100
  33. 33.59 + ? = 100
  34. 34.5 + ? = 10
  35. 35.63 + ? = 100
  36. 36.11 + ? = 100
  37. 37.20 + ? = 100
  38. 38.26 + ? = 100
  39. 39.78 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 6
  2. 8
  3. 75
  4. 77
  5. 79
  6. 2
  7. 7
  8. 9
  9. 14
  10. 81
  11. 36
  12. 25
  13. 12
  14. 71
  15. 44
  16. 73
  17. 20
  18. 4
  19. 3
  20. 60
  21. 47
  22. 82
  23. 63
  24. 58
  25. 57
  26. 65
  27. 54
  28. 78
  29. 1
  30. 72
  31. 83
  32. 85
  33. 41
  34. 5
  35. 37
  36. 89
  37. 80
  38. 74
  39. 22
  40. 56

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