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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 281 · 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. 1.57 + ? = 100
  2. 2.25 + ? = 100
  3. 3.8 + ? = 10
  4. 4.11 + ? = 100
  5. 5.84 + ? = 100
  6. 6.3 + ? = 10
  7. 7.4 + ? = 10
  8. 8.87 + ? = 100
  9. 9.36 + ? = 100
  10. 10.27 + ? = 100
  11. 11.74 + ? = 100
  12. 12.80 + ? = 100
  13. 13.23 + ? = 100
  14. 14.21 + ? = 100
  15. 15.7 + ? = 10
  16. 16.86 + ? = 100
  17. 17.35 + ? = 100
  18. 18.5 + ? = 10
  19. 19.64 + ? = 100
  20. 20.9 + ? = 10
  21. 21.29 + ? = 100
  22. 22.16 + ? = 100
  23. 23.31 + ? = 100
  24. 24.67 + ? = 100
  25. 25.65 + ? = 100
  26. 26.6 + ? = 10
  27. 27.53 + ? = 100
  28. 28.32 + ? = 100
  29. 29.34 + ? = 100
  30. 30.13 + ? = 100
  31. 31.37 + ? = 100
  32. 32.78 + ? = 100
  33. 33.2 + ? = 10
  34. 34.46 + ? = 100
  35. 35.47 + ? = 100
  36. 36.56 + ? = 100
  37. 37.73 + ? = 100
  38. 38.62 + ? = 100
  39. 39.1 + ? = 10
  40. 40.41 + ? = 100

Answer key

  1. 43
  2. 75
  3. 2
  4. 89
  5. 16
  6. 7
  7. 6
  8. 13
  9. 64
  10. 73
  11. 26
  12. 20
  13. 77
  14. 79
  15. 3
  16. 14
  17. 65
  18. 5
  19. 36
  20. 1
  21. 71
  22. 84
  23. 69
  24. 33
  25. 35
  26. 4
  27. 47
  28. 68
  29. 66
  30. 87
  31. 63
  32. 22
  33. 8
  34. 54
  35. 53
  36. 44
  37. 27
  38. 38
  39. 9
  40. 59

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