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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 279 · 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. 1.66 + ? = 100
  2. 2.11 + ? = 100
  3. 3.1 + ? = 10
  4. 4.41 + ? = 100
  5. 5.42 + ? = 100
  6. 6.16 + ? = 100
  7. 7.89 + ? = 100
  8. 8.29 + ? = 100
  9. 9.38 + ? = 100
  10. 10.58 + ? = 100
  11. 11.88 + ? = 100
  12. 12.6 + ? = 10
  13. 13.12 + ? = 100
  14. 14.76 + ? = 100
  15. 15.7 + ? = 10
  16. 16.77 + ? = 100
  17. 17.4 + ? = 10
  18. 18.9 + ? = 10
  19. 19.15 + ? = 100
  20. 20.17 + ? = 100
  21. 21.65 + ? = 100
  22. 22.56 + ? = 100
  23. 23.22 + ? = 100
  24. 24.8 + ? = 10
  25. 25.60 + ? = 100
  26. 26.3 + ? = 10
  27. 27.27 + ? = 100
  28. 28.70 + ? = 100
  29. 29.55 + ? = 100
  30. 30.2 + ? = 10
  31. 31.67 + ? = 100
  32. 32.49 + ? = 100
  33. 33.5 + ? = 10
  34. 34.24 + ? = 100
  35. 35.63 + ? = 100
  36. 36.40 + ? = 100
  37. 37.19 + ? = 100
  38. 38.32 + ? = 100
  39. 39.30 + ? = 100
  40. 40.45 + ? = 100

Answer key

  1. 34
  2. 89
  3. 9
  4. 59
  5. 58
  6. 84
  7. 11
  8. 71
  9. 62
  10. 42
  11. 12
  12. 4
  13. 88
  14. 24
  15. 3
  16. 23
  17. 6
  18. 1
  19. 85
  20. 83
  21. 35
  22. 44
  23. 78
  24. 2
  25. 40
  26. 7
  27. 73
  28. 30
  29. 45
  30. 8
  31. 33
  32. 51
  33. 5
  34. 76
  35. 37
  36. 60
  37. 81
  38. 68
  39. 70
  40. 55

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