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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 624 · 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. 1.51 + ? = 100
  2. 2.4 + ? = 10
  3. 3.26 + ? = 100
  4. 4.69 + ? = 100
  5. 5.73 + ? = 100
  6. 6.39 + ? = 100
  7. 7.2 + ? = 10
  8. 8.21 + ? = 100
  9. 9.53 + ? = 100
  10. 10.83 + ? = 100
  11. 11.5 + ? = 10
  12. 12.50 + ? = 100
  13. 13.71 + ? = 100
  14. 14.80 + ? = 100
  15. 15.8 + ? = 10
  16. 16.41 + ? = 100
  17. 17.87 + ? = 100
  18. 18.60 + ? = 100
  19. 19.42 + ? = 100
  20. 20.12 + ? = 100
  21. 21.88 + ? = 100
  22. 22.85 + ? = 100
  23. 23.63 + ? = 100
  24. 24.1 + ? = 10
  25. 25.36 + ? = 100
  26. 26.55 + ? = 100
  27. 27.20 + ? = 100
  28. 28.9 + ? = 10
  29. 29.29 + ? = 100
  30. 30.3 + ? = 10
  31. 31.18 + ? = 100
  32. 32.58 + ? = 100
  33. 33.11 + ? = 100
  34. 34.31 + ? = 100
  35. 35.61 + ? = 100
  36. 36.28 + ? = 100
  37. 37.44 + ? = 100
  38. 38.70 + ? = 100
  39. 39.65 + ? = 100
  40. 40.59 + ? = 100

Answer key

  1. 49
  2. 6
  3. 74
  4. 31
  5. 27
  6. 61
  7. 8
  8. 79
  9. 47
  10. 17
  11. 5
  12. 50
  13. 29
  14. 20
  15. 2
  16. 59
  17. 13
  18. 40
  19. 58
  20. 88
  21. 12
  22. 15
  23. 37
  24. 9
  25. 64
  26. 45
  27. 80
  28. 1
  29. 71
  30. 7
  31. 82
  32. 42
  33. 89
  34. 69
  35. 39
  36. 72
  37. 56
  38. 30
  39. 35
  40. 41

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