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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 685 · 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. 1.63 + ? = 100
  2. 2.3 + ? = 10
  3. 3.2 + ? = 10
  4. 4.9 + ? = 10
  5. 5.57 + ? = 100
  6. 6.54 + ? = 100
  7. 7.8 + ? = 10
  8. 8.62 + ? = 100
  9. 9.4 + ? = 10
  10. 10.50 + ? = 100
  11. 11.69 + ? = 100
  12. 12.5 + ? = 10
  13. 13.21 + ? = 100
  14. 14.1 + ? = 10
  15. 15.32 + ? = 100
  16. 16.34 + ? = 100
  17. 17.6 + ? = 10
  18. 18.85 + ? = 100
  19. 19.17 + ? = 100
  20. 20.61 + ? = 100
  21. 21.18 + ? = 100
  22. 22.16 + ? = 100
  23. 23.43 + ? = 100
  24. 24.19 + ? = 100
  25. 25.7 + ? = 10
  26. 26.76 + ? = 100
  27. 27.65 + ? = 100
  28. 28.51 + ? = 100
  29. 29.87 + ? = 100
  30. 30.68 + ? = 100
  31. 31.80 + ? = 100
  32. 32.28 + ? = 100
  33. 33.73 + ? = 100
  34. 34.30 + ? = 100
  35. 35.67 + ? = 100
  36. 36.27 + ? = 100
  37. 37.14 + ? = 100
  38. 38.42 + ? = 100
  39. 39.58 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 37
  2. 7
  3. 8
  4. 1
  5. 43
  6. 46
  7. 2
  8. 38
  9. 6
  10. 50
  11. 31
  12. 5
  13. 79
  14. 9
  15. 68
  16. 66
  17. 4
  18. 15
  19. 83
  20. 39
  21. 82
  22. 84
  23. 57
  24. 81
  25. 3
  26. 24
  27. 35
  28. 49
  29. 13
  30. 32
  31. 20
  32. 72
  33. 27
  34. 70
  35. 33
  36. 73
  37. 86
  38. 58
  39. 42
  40. 74

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