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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 407 · 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. 2.2 + ? = 10
  3. 3.57 + ? = 100
  4. 4.28 + ? = 100
  5. 5.9 + ? = 10
  6. 6.1 + ? = 10
  7. 7.43 + ? = 100
  8. 8.76 + ? = 100
  9. 9.47 + ? = 100
  10. 10.16 + ? = 100
  11. 11.72 + ? = 100
  12. 12.7 + ? = 10
  13. 13.3 + ? = 10
  14. 14.56 + ? = 100
  15. 15.54 + ? = 100
  16. 16.81 + ? = 100
  17. 17.50 + ? = 100
  18. 18.4 + ? = 10
  19. 19.84 + ? = 100
  20. 20.36 + ? = 100
  21. 21.75 + ? = 100
  22. 22.8 + ? = 10
  23. 23.89 + ? = 100
  24. 24.45 + ? = 100
  25. 25.69 + ? = 100
  26. 26.73 + ? = 100
  27. 27.30 + ? = 100
  28. 28.34 + ? = 100
  29. 29.64 + ? = 100
  30. 30.41 + ? = 100
  31. 31.5 + ? = 10
  32. 32.21 + ? = 100
  33. 33.33 + ? = 100
  34. 34.18 + ? = 100
  35. 35.39 + ? = 100
  36. 36.38 + ? = 100
  37. 37.12 + ? = 100
  38. 38.22 + ? = 100
  39. 39.51 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 4
  2. 8
  3. 43
  4. 72
  5. 1
  6. 9
  7. 57
  8. 24
  9. 53
  10. 84
  11. 28
  12. 3
  13. 7
  14. 44
  15. 46
  16. 19
  17. 50
  18. 6
  19. 16
  20. 64
  21. 25
  22. 2
  23. 11
  24. 55
  25. 31
  26. 27
  27. 70
  28. 66
  29. 36
  30. 59
  31. 5
  32. 79
  33. 67
  34. 82
  35. 61
  36. 62
  37. 88
  38. 78
  39. 49
  40. 87

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