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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 238 · 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. 1.4 + ? = 10
  2. 2.62 + ? = 100
  3. 3.3 + ? = 10
  4. 4.79 + ? = 100
  5. 5.30 + ? = 100
  6. 6.45 + ? = 100
  7. 7.69 + ? = 100
  8. 8.7 + ? = 10
  9. 9.9 + ? = 10
  10. 10.1 + ? = 10
  11. 11.8 + ? = 10
  12. 12.26 + ? = 100
  13. 13.55 + ? = 100
  14. 14.78 + ? = 100
  15. 15.87 + ? = 100
  16. 16.24 + ? = 100
  17. 17.2 + ? = 10
  18. 18.17 + ? = 100
  19. 19.82 + ? = 100
  20. 20.84 + ? = 100
  21. 21.67 + ? = 100
  22. 22.71 + ? = 100
  23. 23.33 + ? = 100
  24. 24.47 + ? = 100
  25. 25.36 + ? = 100
  26. 26.15 + ? = 100
  27. 27.88 + ? = 100
  28. 28.28 + ? = 100
  29. 29.60 + ? = 100
  30. 30.32 + ? = 100
  31. 31.14 + ? = 100
  32. 32.52 + ? = 100
  33. 33.61 + ? = 100
  34. 34.20 + ? = 100
  35. 35.74 + ? = 100
  36. 36.51 + ? = 100
  37. 37.41 + ? = 100
  38. 38.53 + ? = 100
  39. 39.34 + ? = 100
  40. 40.73 + ? = 100

Answer key

  1. 6
  2. 38
  3. 7
  4. 21
  5. 70
  6. 55
  7. 31
  8. 3
  9. 1
  10. 9
  11. 2
  12. 74
  13. 45
  14. 22
  15. 13
  16. 76
  17. 8
  18. 83
  19. 18
  20. 16
  21. 33
  22. 29
  23. 67
  24. 53
  25. 64
  26. 85
  27. 12
  28. 72
  29. 40
  30. 68
  31. 86
  32. 48
  33. 39
  34. 80
  35. 26
  36. 49
  37. 59
  38. 47
  39. 66
  40. 27

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