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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 559 · 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. 1.20 + ? = 100
  2. 2.26 + ? = 100
  3. 3.65 + ? = 100
  4. 4.1 + ? = 10
  5. 5.69 + ? = 100
  6. 6.2 + ? = 10
  7. 7.6 + ? = 10
  8. 8.3 + ? = 10
  9. 9.5 + ? = 10
  10. 10.60 + ? = 100
  11. 11.50 + ? = 100
  12. 12.87 + ? = 100
  13. 13.59 + ? = 100
  14. 14.82 + ? = 100
  15. 15.57 + ? = 100
  16. 16.54 + ? = 100
  17. 17.13 + ? = 100
  18. 18.72 + ? = 100
  19. 19.73 + ? = 100
  20. 20.22 + ? = 100
  21. 21.52 + ? = 100
  22. 22.53 + ? = 100
  23. 23.8 + ? = 10
  24. 24.23 + ? = 100
  25. 25.29 + ? = 100
  26. 26.55 + ? = 100
  27. 27.14 + ? = 100
  28. 28.32 + ? = 100
  29. 29.21 + ? = 100
  30. 30.7 + ? = 10
  31. 31.40 + ? = 100
  32. 32.44 + ? = 100
  33. 33.77 + ? = 100
  34. 34.51 + ? = 100
  35. 35.61 + ? = 100
  36. 36.89 + ? = 100
  37. 37.63 + ? = 100
  38. 38.70 + ? = 100
  39. 39.75 + ? = 100
  40. 40.28 + ? = 100

Answer key

  1. 80
  2. 74
  3. 35
  4. 9
  5. 31
  6. 8
  7. 4
  8. 7
  9. 5
  10. 40
  11. 50
  12. 13
  13. 41
  14. 18
  15. 43
  16. 46
  17. 87
  18. 28
  19. 27
  20. 78
  21. 48
  22. 47
  23. 2
  24. 77
  25. 71
  26. 45
  27. 86
  28. 68
  29. 79
  30. 3
  31. 60
  32. 56
  33. 23
  34. 49
  35. 39
  36. 11
  37. 37
  38. 30
  39. 25
  40. 72

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