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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 632 · 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. 1.5 + ? = 10
  2. 2.45 + ? = 100
  3. 3.6 + ? = 10
  4. 4.8 + ? = 10
  5. 5.4 + ? = 10
  6. 6.85 + ? = 100
  7. 7.25 + ? = 100
  8. 8.38 + ? = 100
  9. 9.42 + ? = 100
  10. 10.83 + ? = 100
  11. 11.2 + ? = 10
  12. 12.67 + ? = 100
  13. 13.3 + ? = 10
  14. 14.11 + ? = 100
  15. 15.37 + ? = 100
  16. 16.50 + ? = 100
  17. 17.7 + ? = 10
  18. 18.9 + ? = 10
  19. 19.29 + ? = 100
  20. 20.1 + ? = 10
  21. 21.75 + ? = 100
  22. 22.88 + ? = 100
  23. 23.27 + ? = 100
  24. 24.49 + ? = 100
  25. 25.21 + ? = 100
  26. 26.5 + ? = 10
  27. 27.18 + ? = 100
  28. 28.52 + ? = 100
  29. 29.35 + ? = 100
  30. 30.17 + ? = 100
  31. 31.36 + ? = 100
  32. 32.76 + ? = 100
  33. 33.32 + ? = 100
  34. 34.6 + ? = 10
  35. 35.82 + ? = 100
  36. 36.61 + ? = 100
  37. 37.87 + ? = 100
  38. 38.23 + ? = 100
  39. 39.64 + ? = 100
  40. 40.56 + ? = 100

Answer key

  1. 5
  2. 55
  3. 4
  4. 2
  5. 6
  6. 15
  7. 75
  8. 62
  9. 58
  10. 17
  11. 8
  12. 33
  13. 7
  14. 89
  15. 63
  16. 50
  17. 3
  18. 1
  19. 71
  20. 9
  21. 25
  22. 12
  23. 73
  24. 51
  25. 79
  26. 5
  27. 82
  28. 48
  29. 65
  30. 83
  31. 64
  32. 24
  33. 68
  34. 4
  35. 18
  36. 39
  37. 13
  38. 77
  39. 36
  40. 44

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