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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 497 · 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. 1.56 + ? = 100
  2. 2.21 + ? = 100
  3. 3.74 + ? = 100
  4. 4.4 + ? = 10
  5. 5.17 + ? = 100
  6. 6.44 + ? = 100
  7. 7.9 + ? = 10
  8. 8.20 + ? = 100
  9. 9.1 + ? = 10
  10. 10.5 + ? = 10
  11. 11.52 + ? = 100
  12. 12.33 + ? = 100
  13. 13.61 + ? = 100
  14. 14.65 + ? = 100
  15. 15.37 + ? = 100
  16. 16.46 + ? = 100
  17. 17.11 + ? = 100
  18. 18.22 + ? = 100
  19. 19.69 + ? = 100
  20. 20.27 + ? = 100
  21. 21.3 + ? = 10
  22. 22.77 + ? = 100
  23. 23.67 + ? = 100
  24. 24.64 + ? = 100
  25. 25.2 + ? = 10
  26. 26.6 + ? = 10
  27. 27.8 + ? = 10
  28. 28.76 + ? = 100
  29. 29.42 + ? = 100
  30. 30.13 + ? = 100
  31. 31.60 + ? = 100
  32. 32.26 + ? = 100
  33. 33.83 + ? = 100
  34. 34.18 + ? = 100
  35. 35.19 + ? = 100
  36. 36.53 + ? = 100
  37. 37.47 + ? = 100
  38. 38.16 + ? = 100
  39. 39.50 + ? = 100
  40. 40.28 + ? = 100

Answer key

  1. 44
  2. 79
  3. 26
  4. 6
  5. 83
  6. 56
  7. 1
  8. 80
  9. 9
  10. 5
  11. 48
  12. 67
  13. 39
  14. 35
  15. 63
  16. 54
  17. 89
  18. 78
  19. 31
  20. 73
  21. 7
  22. 23
  23. 33
  24. 36
  25. 8
  26. 4
  27. 2
  28. 24
  29. 58
  30. 87
  31. 40
  32. 74
  33. 17
  34. 82
  35. 81
  36. 47
  37. 53
  38. 84
  39. 50
  40. 72

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