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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 978 · 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. 1.5 + ? = 10
  2. 2.9 + ? = 10
  3. 3.33 + ? = 100
  4. 4.8 + ? = 10
  5. 5.24 + ? = 100
  6. 6.7 + ? = 10
  7. 7.12 + ? = 100
  8. 8.1 + ? = 10
  9. 9.29 + ? = 100
  10. 10.19 + ? = 100
  11. 11.2 + ? = 10
  12. 12.34 + ? = 100
  13. 13.83 + ? = 100
  14. 14.30 + ? = 100
  15. 15.20 + ? = 100
  16. 16.45 + ? = 100
  17. 17.25 + ? = 100
  18. 18.89 + ? = 100
  19. 19.67 + ? = 100
  20. 20.26 + ? = 100
  21. 21.6 + ? = 10
  22. 22.3 + ? = 10
  23. 23.42 + ? = 100
  24. 24.4 + ? = 10
  25. 25.32 + ? = 100
  26. 26.84 + ? = 100
  27. 27.72 + ? = 100
  28. 28.76 + ? = 100
  29. 29.68 + ? = 100
  30. 30.31 + ? = 100
  31. 31.38 + ? = 100
  32. 32.55 + ? = 100
  33. 33.18 + ? = 100
  34. 34.28 + ? = 100
  35. 35.61 + ? = 100
  36. 36.85 + ? = 100
  37. 37.82 + ? = 100
  38. 38.27 + ? = 100
  39. 39.44 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 5
  2. 1
  3. 67
  4. 2
  5. 76
  6. 3
  7. 88
  8. 9
  9. 71
  10. 81
  11. 8
  12. 66
  13. 17
  14. 70
  15. 80
  16. 55
  17. 75
  18. 11
  19. 33
  20. 74
  21. 4
  22. 7
  23. 58
  24. 6
  25. 68
  26. 16
  27. 28
  28. 24
  29. 32
  30. 69
  31. 62
  32. 45
  33. 82
  34. 72
  35. 39
  36. 15
  37. 18
  38. 73
  39. 56
  40. 87

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