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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 288 · 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. 1.6 + ? = 10
  2. 2.1 + ? = 10
  3. 3.7 + ? = 10
  4. 4.2 + ? = 10
  5. 5.58 + ? = 100
  6. 6.25 + ? = 100
  7. 7.23 + ? = 100
  8. 8.40 + ? = 100
  9. 9.15 + ? = 100
  10. 10.80 + ? = 100
  11. 11.34 + ? = 100
  12. 12.22 + ? = 100
  13. 13.49 + ? = 100
  14. 14.9 + ? = 10
  15. 15.48 + ? = 100
  16. 16.12 + ? = 100
  17. 17.83 + ? = 100
  18. 18.14 + ? = 100
  19. 19.41 + ? = 100
  20. 20.72 + ? = 100
  21. 21.3 + ? = 10
  22. 22.56 + ? = 100
  23. 23.8 + ? = 10
  24. 24.5 + ? = 10
  25. 25.4 + ? = 10
  26. 26.46 + ? = 100
  27. 27.73 + ? = 100
  28. 28.33 + ? = 100
  29. 29.37 + ? = 100
  30. 30.13 + ? = 100
  31. 31.44 + ? = 100
  32. 32.85 + ? = 100
  33. 33.11 + ? = 100
  34. 34.31 + ? = 100
  35. 35.81 + ? = 100
  36. 36.32 + ? = 100
  37. 37.52 + ? = 100
  38. 38.19 + ? = 100
  39. 39.27 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 4
  2. 9
  3. 3
  4. 8
  5. 42
  6. 75
  7. 77
  8. 60
  9. 85
  10. 20
  11. 66
  12. 78
  13. 51
  14. 1
  15. 52
  16. 88
  17. 17
  18. 86
  19. 59
  20. 28
  21. 7
  22. 44
  23. 2
  24. 5
  25. 6
  26. 54
  27. 27
  28. 67
  29. 63
  30. 87
  31. 56
  32. 15
  33. 89
  34. 69
  35. 19
  36. 68
  37. 48
  38. 81
  39. 73
  40. 45

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