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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 975 · 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. 1.3 + ? = 10
  2. 2.5 + ? = 10
  3. 3.69 + ? = 100
  4. 4.34 + ? = 100
  5. 5.6 + ? = 10
  6. 6.88 + ? = 100
  7. 7.4 + ? = 10
  8. 8.2 + ? = 10
  9. 9.9 + ? = 10
  10. 10.30 + ? = 100
  11. 11.19 + ? = 100
  12. 12.12 + ? = 100
  13. 13.47 + ? = 100
  14. 14.76 + ? = 100
  15. 15.18 + ? = 100
  16. 16.54 + ? = 100
  17. 17.68 + ? = 100
  18. 18.1 + ? = 10
  19. 19.70 + ? = 100
  20. 20.72 + ? = 100
  21. 21.29 + ? = 100
  22. 22.41 + ? = 100
  23. 23.32 + ? = 100
  24. 24.28 + ? = 100
  25. 25.33 + ? = 100
  26. 26.58 + ? = 100
  27. 27.31 + ? = 100
  28. 28.37 + ? = 100
  29. 29.65 + ? = 100
  30. 30.7 + ? = 10
  31. 31.79 + ? = 100
  32. 32.66 + ? = 100
  33. 33.42 + ? = 100
  34. 34.15 + ? = 100
  35. 35.24 + ? = 100
  36. 36.57 + ? = 100
  37. 37.36 + ? = 100
  38. 38.48 + ? = 100
  39. 39.89 + ? = 100
  40. 40.50 + ? = 100

Answer key

  1. 7
  2. 5
  3. 31
  4. 66
  5. 4
  6. 12
  7. 6
  8. 8
  9. 1
  10. 70
  11. 81
  12. 88
  13. 53
  14. 24
  15. 82
  16. 46
  17. 32
  18. 9
  19. 30
  20. 28
  21. 71
  22. 59
  23. 68
  24. 72
  25. 67
  26. 42
  27. 69
  28. 63
  29. 35
  30. 3
  31. 21
  32. 34
  33. 58
  34. 85
  35. 76
  36. 43
  37. 64
  38. 52
  39. 11
  40. 50

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