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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 193 · 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. 1.7 + ? = 10
  2. 2.9 + ? = 10
  3. 3.8 + ? = 10
  4. 4.21 + ? = 100
  5. 5.33 + ? = 100
  6. 6.1 + ? = 10
  7. 7.50 + ? = 100
  8. 8.40 + ? = 100
  9. 9.49 + ? = 100
  10. 10.65 + ? = 100
  11. 11.47 + ? = 100
  12. 12.18 + ? = 100
  13. 13.17 + ? = 100
  14. 14.71 + ? = 100
  15. 15.55 + ? = 100
  16. 16.37 + ? = 100
  17. 17.5 + ? = 10
  18. 18.83 + ? = 100
  19. 19.46 + ? = 100
  20. 20.31 + ? = 100
  21. 21.4 + ? = 10
  22. 22.79 + ? = 100
  23. 23.61 + ? = 100
  24. 24.6 + ? = 10
  25. 25.80 + ? = 100
  26. 26.2 + ? = 10
  27. 27.75 + ? = 100
  28. 28.57 + ? = 100
  29. 29.88 + ? = 100
  30. 30.45 + ? = 100
  31. 31.68 + ? = 100
  32. 32.34 + ? = 100
  33. 33.3 + ? = 10
  34. 34.51 + ? = 100
  35. 35.64 + ? = 100
  36. 36.77 + ? = 100
  37. 37.43 + ? = 100
  38. 38.11 + ? = 100
  39. 39.19 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 3
  2. 1
  3. 2
  4. 79
  5. 67
  6. 9
  7. 50
  8. 60
  9. 51
  10. 35
  11. 53
  12. 82
  13. 83
  14. 29
  15. 45
  16. 63
  17. 5
  18. 17
  19. 54
  20. 69
  21. 6
  22. 21
  23. 39
  24. 4
  25. 20
  26. 8
  27. 25
  28. 43
  29. 12
  30. 55
  31. 32
  32. 66
  33. 7
  34. 49
  35. 36
  36. 23
  37. 57
  38. 89
  39. 81
  40. 16

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