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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 236 · 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. 1.85 + ? = 100
  2. 2.50 + ? = 100
  3. 3.88 + ? = 100
  4. 4.81 + ? = 100
  5. 5.3 + ? = 10
  6. 6.74 + ? = 100
  7. 7.49 + ? = 100
  8. 8.1 + ? = 10
  9. 9.2 + ? = 10
  10. 10.68 + ? = 100
  11. 11.5 + ? = 10
  12. 12.34 + ? = 100
  13. 13.82 + ? = 100
  14. 14.61 + ? = 100
  15. 15.11 + ? = 100
  16. 16.4 + ? = 10
  17. 17.8 + ? = 10
  18. 18.7 + ? = 10
  19. 19.72 + ? = 100
  20. 20.59 + ? = 100
  21. 21.12 + ? = 100
  22. 22.47 + ? = 100
  23. 23.58 + ? = 100
  24. 24.53 + ? = 100
  25. 25.63 + ? = 100
  26. 26.76 + ? = 100
  27. 27.38 + ? = 100
  28. 28.43 + ? = 100
  29. 29.6 + ? = 10
  30. 30.45 + ? = 100
  31. 31.56 + ? = 100
  32. 32.46 + ? = 100
  33. 33.66 + ? = 100
  34. 34.25 + ? = 100
  35. 35.40 + ? = 100
  36. 36.9 + ? = 10
  37. 37.57 + ? = 100
  38. 38.13 + ? = 100
  39. 39.73 + ? = 100
  40. 40.21 + ? = 100

Answer key

  1. 15
  2. 50
  3. 12
  4. 19
  5. 7
  6. 26
  7. 51
  8. 9
  9. 8
  10. 32
  11. 5
  12. 66
  13. 18
  14. 39
  15. 89
  16. 6
  17. 2
  18. 3
  19. 28
  20. 41
  21. 88
  22. 53
  23. 42
  24. 47
  25. 37
  26. 24
  27. 62
  28. 57
  29. 4
  30. 55
  31. 44
  32. 54
  33. 34
  34. 75
  35. 60
  36. 1
  37. 43
  38. 87
  39. 27
  40. 79

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