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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 670 · 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. 2.3 + ? = 10
  3. 3.4 + ? = 10
  4. 4.9 + ? = 10
  5. 5.51 + ? = 100
  6. 6.88 + ? = 100
  7. 7.73 + ? = 100
  8. 8.5 + ? = 10
  9. 9.65 + ? = 100
  10. 10.77 + ? = 100
  11. 11.1 + ? = 10
  12. 12.84 + ? = 100
  13. 13.71 + ? = 100
  14. 14.24 + ? = 100
  15. 15.2 + ? = 10
  16. 16.11 + ? = 100
  17. 17.83 + ? = 100
  18. 18.69 + ? = 100
  19. 19.36 + ? = 100
  20. 20.19 + ? = 100
  21. 21.67 + ? = 100
  22. 22.48 + ? = 100
  23. 23.45 + ? = 100
  24. 24.55 + ? = 100
  25. 25.59 + ? = 100
  26. 26.58 + ? = 100
  27. 27.26 + ? = 100
  28. 28.21 + ? = 100
  29. 29.42 + ? = 100
  30. 30.27 + ? = 100
  31. 31.85 + ? = 100
  32. 32.8 + ? = 10
  33. 33.66 + ? = 100
  34. 34.14 + ? = 100
  35. 35.82 + ? = 100
  36. 36.87 + ? = 100
  37. 37.50 + ? = 100
  38. 38.46 + ? = 100
  39. 39.7 + ? = 10
  40. 40.63 + ? = 100

Answer key

  1. 4
  2. 7
  3. 6
  4. 1
  5. 49
  6. 12
  7. 27
  8. 5
  9. 35
  10. 23
  11. 9
  12. 16
  13. 29
  14. 76
  15. 8
  16. 89
  17. 17
  18. 31
  19. 64
  20. 81
  21. 33
  22. 52
  23. 55
  24. 45
  25. 41
  26. 42
  27. 74
  28. 79
  29. 58
  30. 73
  31. 15
  32. 2
  33. 34
  34. 86
  35. 18
  36. 13
  37. 50
  38. 54
  39. 3
  40. 37

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