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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 565 · 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. 2.22 + ? = 100
  3. 3.1 + ? = 10
  4. 4.7 + ? = 10
  5. 5.76 + ? = 100
  6. 6.19 + ? = 100
  7. 7.6 + ? = 10
  8. 8.15 + ? = 100
  9. 9.23 + ? = 100
  10. 10.2 + ? = 10
  11. 11.5 + ? = 10
  12. 12.82 + ? = 100
  13. 13.43 + ? = 100
  14. 14.31 + ? = 100
  15. 15.84 + ? = 100
  16. 16.64 + ? = 100
  17. 17.24 + ? = 100
  18. 18.33 + ? = 100
  19. 19.79 + ? = 100
  20. 20.32 + ? = 100
  21. 21.62 + ? = 100
  22. 22.55 + ? = 100
  23. 23.3 + ? = 10
  24. 24.59 + ? = 100
  25. 25.72 + ? = 100
  26. 26.88 + ? = 100
  27. 27.41 + ? = 100
  28. 28.40 + ? = 100
  29. 29.77 + ? = 100
  30. 30.50 + ? = 100
  31. 31.61 + ? = 100
  32. 32.27 + ? = 100
  33. 33.65 + ? = 100
  34. 34.57 + ? = 100
  35. 35.29 + ? = 100
  36. 36.83 + ? = 100
  37. 37.4 + ? = 10
  38. 38.9 + ? = 10
  39. 39.78 + ? = 100
  40. 40.12 + ? = 100

Answer key

  1. 2
  2. 78
  3. 9
  4. 3
  5. 24
  6. 81
  7. 4
  8. 85
  9. 77
  10. 8
  11. 5
  12. 18
  13. 57
  14. 69
  15. 16
  16. 36
  17. 76
  18. 67
  19. 21
  20. 68
  21. 38
  22. 45
  23. 7
  24. 41
  25. 28
  26. 12
  27. 59
  28. 60
  29. 23
  30. 50
  31. 39
  32. 73
  33. 35
  34. 43
  35. 71
  36. 17
  37. 6
  38. 1
  39. 22
  40. 88

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