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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 145 · 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. 1.6 + ? = 10
  2. 2.9 + ? = 10
  3. 3.3 + ? = 10
  4. 4.1 + ? = 10
  5. 5.18 + ? = 100
  6. 6.5 + ? = 10
  7. 7.23 + ? = 100
  8. 8.78 + ? = 100
  9. 9.69 + ? = 100
  10. 10.20 + ? = 100
  11. 11.4 + ? = 10
  12. 12.40 + ? = 100
  13. 13.43 + ? = 100
  14. 14.84 + ? = 100
  15. 15.11 + ? = 100
  16. 16.7 + ? = 10
  17. 17.12 + ? = 100
  18. 18.30 + ? = 100
  19. 19.55 + ? = 100
  20. 20.58 + ? = 100
  21. 21.39 + ? = 100
  22. 22.13 + ? = 100
  23. 23.14 + ? = 100
  24. 24.67 + ? = 100
  25. 25.37 + ? = 100
  26. 26.38 + ? = 100
  27. 27.73 + ? = 100
  28. 28.15 + ? = 100
  29. 29.31 + ? = 100
  30. 30.36 + ? = 100
  31. 31.86 + ? = 100
  32. 32.17 + ? = 100
  33. 33.8 + ? = 10
  34. 34.2 + ? = 10
  35. 35.60 + ? = 100
  36. 36.28 + ? = 100
  37. 37.22 + ? = 100
  38. 38.19 + ? = 100
  39. 39.49 + ? = 100
  40. 40.63 + ? = 100

Answer key

  1. 4
  2. 1
  3. 7
  4. 9
  5. 82
  6. 5
  7. 77
  8. 22
  9. 31
  10. 80
  11. 6
  12. 60
  13. 57
  14. 16
  15. 89
  16. 3
  17. 88
  18. 70
  19. 45
  20. 42
  21. 61
  22. 87
  23. 86
  24. 33
  25. 63
  26. 62
  27. 27
  28. 85
  29. 69
  30. 64
  31. 14
  32. 83
  33. 2
  34. 8
  35. 40
  36. 72
  37. 78
  38. 81
  39. 51
  40. 37

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