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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 250 · 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. 1.2 + ? = 10
  2. 2.4 + ? = 10
  3. 3.48 + ? = 100
  4. 4.29 + ? = 100
  5. 5.59 + ? = 100
  6. 6.16 + ? = 100
  7. 7.77 + ? = 100
  8. 8.5 + ? = 10
  9. 9.30 + ? = 100
  10. 10.84 + ? = 100
  11. 11.67 + ? = 100
  12. 12.33 + ? = 100
  13. 13.1 + ? = 10
  14. 14.73 + ? = 100
  15. 15.87 + ? = 100
  16. 16.7 + ? = 10
  17. 17.3 + ? = 10
  18. 18.65 + ? = 100
  19. 19.63 + ? = 100
  20. 20.34 + ? = 100
  21. 21.35 + ? = 100
  22. 22.80 + ? = 100
  23. 23.58 + ? = 100
  24. 24.6 + ? = 10
  25. 25.44 + ? = 100
  26. 26.83 + ? = 100
  27. 27.23 + ? = 100
  28. 28.38 + ? = 100
  29. 29.18 + ? = 100
  30. 30.64 + ? = 100
  31. 31.49 + ? = 100
  32. 32.9 + ? = 10
  33. 33.8 + ? = 10
  34. 34.69 + ? = 100
  35. 35.74 + ? = 100
  36. 36.88 + ? = 100
  37. 37.15 + ? = 100
  38. 38.60 + ? = 100
  39. 39.36 + ? = 100
  40. 40.39 + ? = 100

Answer key

  1. 8
  2. 6
  3. 52
  4. 71
  5. 41
  6. 84
  7. 23
  8. 5
  9. 70
  10. 16
  11. 33
  12. 67
  13. 9
  14. 27
  15. 13
  16. 3
  17. 7
  18. 35
  19. 37
  20. 66
  21. 65
  22. 20
  23. 42
  24. 4
  25. 56
  26. 17
  27. 77
  28. 62
  29. 82
  30. 36
  31. 51
  32. 1
  33. 2
  34. 31
  35. 26
  36. 12
  37. 85
  38. 40
  39. 64
  40. 61

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