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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 860 · 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. 1.59 + ? = 100
  2. 2.68 + ? = 100
  3. 3.63 + ? = 100
  4. 4.7 + ? = 10
  5. 5.12 + ? = 100
  6. 6.85 + ? = 100
  7. 7.6 + ? = 10
  8. 8.23 + ? = 100
  9. 9.52 + ? = 100
  10. 10.81 + ? = 100
  11. 11.1 + ? = 10
  12. 12.4 + ? = 10
  13. 13.9 + ? = 10
  14. 14.30 + ? = 100
  15. 15.2 + ? = 10
  16. 16.83 + ? = 100
  17. 17.70 + ? = 100
  18. 18.13 + ? = 100
  19. 19.8 + ? = 10
  20. 20.69 + ? = 100
  21. 21.34 + ? = 100
  22. 22.44 + ? = 100
  23. 23.24 + ? = 100
  24. 24.47 + ? = 100
  25. 25.3 + ? = 10
  26. 26.26 + ? = 100
  27. 27.28 + ? = 100
  28. 28.73 + ? = 100
  29. 29.88 + ? = 100
  30. 30.11 + ? = 100
  31. 31.60 + ? = 100
  32. 32.48 + ? = 100
  33. 33.45 + ? = 100
  34. 34.5 + ? = 10
  35. 35.25 + ? = 100
  36. 36.43 + ? = 100
  37. 37.78 + ? = 100
  38. 38.18 + ? = 100
  39. 39.77 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 41
  2. 32
  3. 37
  4. 3
  5. 88
  6. 15
  7. 4
  8. 77
  9. 48
  10. 19
  11. 9
  12. 6
  13. 1
  14. 70
  15. 8
  16. 17
  17. 30
  18. 87
  19. 2
  20. 31
  21. 66
  22. 56
  23. 76
  24. 53
  25. 7
  26. 74
  27. 72
  28. 27
  29. 12
  30. 89
  31. 40
  32. 52
  33. 55
  34. 5
  35. 75
  36. 57
  37. 22
  38. 82
  39. 23
  40. 81

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