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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 411 · 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. 2.5 + ? = 10
  3. 3.66 + ? = 100
  4. 4.1 + ? = 10
  5. 5.19 + ? = 100
  6. 6.30 + ? = 100
  7. 7.56 + ? = 100
  8. 8.8 + ? = 10
  9. 9.64 + ? = 100
  10. 10.20 + ? = 100
  11. 11.14 + ? = 100
  12. 12.87 + ? = 100
  13. 13.27 + ? = 100
  14. 14.9 + ? = 10
  15. 15.58 + ? = 100
  16. 16.28 + ? = 100
  17. 17.4 + ? = 10
  18. 18.7 + ? = 10
  19. 19.89 + ? = 100
  20. 20.6 + ? = 10
  21. 21.24 + ? = 100
  22. 22.41 + ? = 100
  23. 23.42 + ? = 100
  24. 24.69 + ? = 100
  25. 25.2 + ? = 10
  26. 26.79 + ? = 100
  27. 27.57 + ? = 100
  28. 28.54 + ? = 100
  29. 29.18 + ? = 100
  30. 30.60 + ? = 100
  31. 31.80 + ? = 100
  32. 32.84 + ? = 100
  33. 33.82 + ? = 100
  34. 34.75 + ? = 100
  35. 35.50 + ? = 100
  36. 36.51 + ? = 100
  37. 37.11 + ? = 100
  38. 38.22 + ? = 100
  39. 39.44 + ? = 100
  40. 40.68 + ? = 100

Answer key

  1. 7
  2. 5
  3. 34
  4. 9
  5. 81
  6. 70
  7. 44
  8. 2
  9. 36
  10. 80
  11. 86
  12. 13
  13. 73
  14. 1
  15. 42
  16. 72
  17. 6
  18. 3
  19. 11
  20. 4
  21. 76
  22. 59
  23. 58
  24. 31
  25. 8
  26. 21
  27. 43
  28. 46
  29. 82
  30. 40
  31. 20
  32. 16
  33. 18
  34. 25
  35. 50
  36. 49
  37. 89
  38. 78
  39. 56
  40. 32

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