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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 459 · 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. 1.7 + ? = 10
  2. 2.8 + ? = 10
  3. 3.6 + ? = 10
  4. 4.87 + ? = 100
  5. 5.23 + ? = 100
  6. 6.31 + ? = 100
  7. 7.88 + ? = 100
  8. 8.1 + ? = 10
  9. 9.15 + ? = 100
  10. 10.4 + ? = 10
  11. 11.53 + ? = 100
  12. 12.9 + ? = 10
  13. 13.27 + ? = 100
  14. 14.35 + ? = 100
  15. 15.74 + ? = 100
  16. 16.52 + ? = 100
  17. 17.64 + ? = 100
  18. 18.5 + ? = 10
  19. 19.42 + ? = 100
  20. 20.44 + ? = 100
  21. 21.85 + ? = 100
  22. 22.22 + ? = 100
  23. 23.38 + ? = 100
  24. 24.79 + ? = 100
  25. 25.82 + ? = 100
  26. 26.73 + ? = 100
  27. 27.26 + ? = 100
  28. 28.3 + ? = 10
  29. 29.66 + ? = 100
  30. 30.30 + ? = 100
  31. 31.71 + ? = 100
  32. 32.2 + ? = 10
  33. 33.55 + ? = 100
  34. 34.54 + ? = 100
  35. 35.34 + ? = 100
  36. 36.39 + ? = 100
  37. 37.50 + ? = 100
  38. 38.75 + ? = 100
  39. 39.25 + ? = 100
  40. 40.41 + ? = 100

Answer key

  1. 3
  2. 2
  3. 4
  4. 13
  5. 77
  6. 69
  7. 12
  8. 9
  9. 85
  10. 6
  11. 47
  12. 1
  13. 73
  14. 65
  15. 26
  16. 48
  17. 36
  18. 5
  19. 58
  20. 56
  21. 15
  22. 78
  23. 62
  24. 21
  25. 18
  26. 27
  27. 74
  28. 7
  29. 34
  30. 70
  31. 29
  32. 8
  33. 45
  34. 46
  35. 66
  36. 61
  37. 50
  38. 25
  39. 75
  40. 59

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