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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 493 · 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. 1.30 + ? = 100
  2. 2.83 + ? = 100
  3. 3.82 + ? = 100
  4. 4.33 + ? = 100
  5. 5.34 + ? = 100
  6. 6.8 + ? = 10
  7. 7.3 + ? = 10
  8. 8.22 + ? = 100
  9. 9.1 + ? = 10
  10. 10.2 + ? = 10
  11. 11.55 + ? = 100
  12. 12.23 + ? = 100
  13. 13.6 + ? = 10
  14. 14.5 + ? = 10
  15. 15.46 + ? = 100
  16. 16.62 + ? = 100
  17. 17.4 + ? = 10
  18. 18.40 + ? = 100
  19. 19.58 + ? = 100
  20. 20.7 + ? = 10
  21. 21.38 + ? = 100
  22. 22.78 + ? = 100
  23. 23.44 + ? = 100
  24. 24.43 + ? = 100
  25. 25.31 + ? = 100
  26. 26.65 + ? = 100
  27. 27.88 + ? = 100
  28. 28.9 + ? = 10
  29. 29.52 + ? = 100
  30. 30.66 + ? = 100
  31. 31.89 + ? = 100
  32. 32.69 + ? = 100
  33. 33.25 + ? = 100
  34. 34.77 + ? = 100
  35. 35.85 + ? = 100
  36. 36.72 + ? = 100
  37. 37.45 + ? = 100
  38. 38.37 + ? = 100
  39. 39.64 + ? = 100
  40. 40.67 + ? = 100

Answer key

  1. 70
  2. 17
  3. 18
  4. 67
  5. 66
  6. 2
  7. 7
  8. 78
  9. 9
  10. 8
  11. 45
  12. 77
  13. 4
  14. 5
  15. 54
  16. 38
  17. 6
  18. 60
  19. 42
  20. 3
  21. 62
  22. 22
  23. 56
  24. 57
  25. 69
  26. 35
  27. 12
  28. 1
  29. 48
  30. 34
  31. 11
  32. 31
  33. 75
  34. 23
  35. 15
  36. 28
  37. 55
  38. 63
  39. 36
  40. 33

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