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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 207 · 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. 2.50 + ? = 100
  3. 3.5 + ? = 10
  4. 4.49 + ? = 100
  5. 5.37 + ? = 100
  6. 6.80 + ? = 100
  7. 7.31 + ? = 100
  8. 8.15 + ? = 100
  9. 9.9 + ? = 10
  10. 10.61 + ? = 100
  11. 11.1 + ? = 10
  12. 12.87 + ? = 100
  13. 13.3 + ? = 10
  14. 14.44 + ? = 100
  15. 15.24 + ? = 100
  16. 16.62 + ? = 100
  17. 17.6 + ? = 10
  18. 18.12 + ? = 100
  19. 19.18 + ? = 100
  20. 20.42 + ? = 100
  21. 21.78 + ? = 100
  22. 22.79 + ? = 100
  23. 23.41 + ? = 100
  24. 24.68 + ? = 100
  25. 25.67 + ? = 100
  26. 26.84 + ? = 100
  27. 27.8 + ? = 10
  28. 28.70 + ? = 100
  29. 29.72 + ? = 100
  30. 30.59 + ? = 100
  31. 31.19 + ? = 100
  32. 32.69 + ? = 100
  33. 33.63 + ? = 100
  34. 34.64 + ? = 100
  35. 35.28 + ? = 100
  36. 36.35 + ? = 100
  37. 37.86 + ? = 100
  38. 38.36 + ? = 100
  39. 39.52 + ? = 100
  40. 40.46 + ? = 100

Answer key

  1. 8
  2. 50
  3. 5
  4. 51
  5. 63
  6. 20
  7. 69
  8. 85
  9. 1
  10. 39
  11. 9
  12. 13
  13. 7
  14. 56
  15. 76
  16. 38
  17. 4
  18. 88
  19. 82
  20. 58
  21. 22
  22. 21
  23. 59
  24. 32
  25. 33
  26. 16
  27. 2
  28. 30
  29. 28
  30. 41
  31. 81
  32. 31
  33. 37
  34. 36
  35. 72
  36. 65
  37. 14
  38. 64
  39. 48
  40. 54

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