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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 148 · 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. 1.13 + ? = 100
  2. 2.53 + ? = 100
  3. 3.3 + ? = 10
  4. 4.1 + ? = 10
  5. 5.8 + ? = 10
  6. 6.7 + ? = 10
  7. 7.34 + ? = 100
  8. 8.2 + ? = 10
  9. 9.30 + ? = 100
  10. 10.75 + ? = 100
  11. 11.35 + ? = 100
  12. 12.85 + ? = 100
  13. 13.57 + ? = 100
  14. 14.88 + ? = 100
  15. 15.59 + ? = 100
  16. 16.9 + ? = 10
  17. 17.82 + ? = 100
  18. 18.73 + ? = 100
  19. 19.49 + ? = 100
  20. 20.68 + ? = 100
  21. 21.6 + ? = 10
  22. 22.18 + ? = 100
  23. 23.62 + ? = 100
  24. 24.4 + ? = 10
  25. 25.29 + ? = 100
  26. 26.74 + ? = 100
  27. 27.46 + ? = 100
  28. 28.45 + ? = 100
  29. 29.33 + ? = 100
  30. 30.52 + ? = 100
  31. 31.36 + ? = 100
  32. 32.37 + ? = 100
  33. 33.26 + ? = 100
  34. 34.78 + ? = 100
  35. 35.27 + ? = 100
  36. 36.76 + ? = 100
  37. 37.5 + ? = 10
  38. 38.39 + ? = 100
  39. 39.51 + ? = 100
  40. 40.42 + ? = 100

Answer key

  1. 87
  2. 47
  3. 7
  4. 9
  5. 2
  6. 3
  7. 66
  8. 8
  9. 70
  10. 25
  11. 65
  12. 15
  13. 43
  14. 12
  15. 41
  16. 1
  17. 18
  18. 27
  19. 51
  20. 32
  21. 4
  22. 82
  23. 38
  24. 6
  25. 71
  26. 26
  27. 54
  28. 55
  29. 67
  30. 48
  31. 64
  32. 63
  33. 74
  34. 22
  35. 73
  36. 24
  37. 5
  38. 61
  39. 49
  40. 58

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