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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 625 · 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. 1.8 + ? = 10
  2. 2.1 + ? = 10
  3. 3.81 + ? = 100
  4. 4.19 + ? = 100
  5. 5.6 + ? = 10
  6. 6.74 + ? = 100
  7. 7.21 + ? = 100
  8. 8.47 + ? = 100
  9. 9.46 + ? = 100
  10. 10.52 + ? = 100
  11. 11.9 + ? = 10
  12. 12.4 + ? = 10
  13. 13.16 + ? = 100
  14. 14.58 + ? = 100
  15. 15.2 + ? = 10
  16. 16.86 + ? = 100
  17. 17.3 + ? = 10
  18. 18.17 + ? = 100
  19. 19.23 + ? = 100
  20. 20.75 + ? = 100
  21. 21.57 + ? = 100
  22. 22.5 + ? = 10
  23. 23.49 + ? = 100
  24. 24.64 + ? = 100
  25. 25.20 + ? = 100
  26. 26.60 + ? = 100
  27. 27.48 + ? = 100
  28. 28.78 + ? = 100
  29. 29.63 + ? = 100
  30. 30.7 + ? = 10
  31. 31.15 + ? = 100
  32. 32.37 + ? = 100
  33. 33.26 + ? = 100
  34. 34.30 + ? = 100
  35. 35.32 + ? = 100
  36. 36.38 + ? = 100
  37. 37.44 + ? = 100
  38. 38.36 + ? = 100
  39. 39.34 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 2
  2. 9
  3. 19
  4. 81
  5. 4
  6. 26
  7. 79
  8. 53
  9. 54
  10. 48
  11. 1
  12. 6
  13. 84
  14. 42
  15. 8
  16. 14
  17. 7
  18. 83
  19. 77
  20. 25
  21. 43
  22. 5
  23. 51
  24. 36
  25. 80
  26. 40
  27. 52
  28. 22
  29. 37
  30. 3
  31. 85
  32. 63
  33. 74
  34. 70
  35. 68
  36. 62
  37. 56
  38. 64
  39. 66
  40. 21

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