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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 123 · 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. 2.80 + ? = 100
  3. 3.58 + ? = 100
  4. 4.55 + ? = 100
  5. 5.3 + ? = 10
  6. 6.8 + ? = 10
  7. 7.1 + ? = 10
  8. 8.70 + ? = 100
  9. 9.85 + ? = 100
  10. 10.21 + ? = 100
  11. 11.6 + ? = 10
  12. 12.19 + ? = 100
  13. 13.73 + ? = 100
  14. 14.43 + ? = 100
  15. 15.2 + ? = 10
  16. 16.27 + ? = 100
  17. 17.86 + ? = 100
  18. 18.9 + ? = 10
  19. 19.7 + ? = 10
  20. 20.57 + ? = 100
  21. 21.69 + ? = 100
  22. 22.53 + ? = 100
  23. 23.78 + ? = 100
  24. 24.68 + ? = 100
  25. 25.34 + ? = 100
  26. 26.84 + ? = 100
  27. 27.44 + ? = 100
  28. 28.32 + ? = 100
  29. 29.81 + ? = 100
  30. 30.50 + ? = 100
  31. 31.46 + ? = 100
  32. 32.5 + ? = 10
  33. 33.37 + ? = 100
  34. 34.77 + ? = 100
  35. 35.25 + ? = 100
  36. 36.49 + ? = 100
  37. 37.71 + ? = 100
  38. 38.82 + ? = 100
  39. 39.54 + ? = 100
  40. 40.62 + ? = 100

Answer key

  1. 6
  2. 20
  3. 42
  4. 45
  5. 7
  6. 2
  7. 9
  8. 30
  9. 15
  10. 79
  11. 4
  12. 81
  13. 27
  14. 57
  15. 8
  16. 73
  17. 14
  18. 1
  19. 3
  20. 43
  21. 31
  22. 47
  23. 22
  24. 32
  25. 66
  26. 16
  27. 56
  28. 68
  29. 19
  30. 50
  31. 54
  32. 5
  33. 63
  34. 23
  35. 75
  36. 51
  37. 29
  38. 18
  39. 46
  40. 38

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