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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 791 · 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. 2.61 + ? = 100
  3. 3.51 + ? = 100
  4. 4.1 + ? = 10
  5. 5.6 + ? = 10
  6. 6.4 + ? = 10
  7. 7.8 + ? = 10
  8. 8.9 + ? = 10
  9. 9.38 + ? = 100
  10. 10.3 + ? = 10
  11. 11.7 + ? = 10
  12. 12.52 + ? = 100
  13. 13.23 + ? = 100
  14. 14.5 + ? = 10
  15. 15.36 + ? = 100
  16. 16.15 + ? = 100
  17. 17.17 + ? = 100
  18. 18.21 + ? = 100
  19. 19.28 + ? = 100
  20. 20.62 + ? = 100
  21. 21.24 + ? = 100
  22. 22.16 + ? = 100
  23. 23.13 + ? = 100
  24. 24.30 + ? = 100
  25. 25.59 + ? = 100
  26. 26.19 + ? = 100
  27. 27.67 + ? = 100
  28. 28.57 + ? = 100
  29. 29.84 + ? = 100
  30. 30.71 + ? = 100
  31. 31.34 + ? = 100
  32. 32.83 + ? = 100
  33. 33.68 + ? = 100
  34. 34.20 + ? = 100
  35. 35.88 + ? = 100
  36. 36.73 + ? = 100
  37. 37.14 + ? = 100
  38. 38.41 + ? = 100
  39. 39.72 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 8
  2. 39
  3. 49
  4. 9
  5. 4
  6. 6
  7. 2
  8. 1
  9. 62
  10. 7
  11. 3
  12. 48
  13. 77
  14. 5
  15. 64
  16. 85
  17. 83
  18. 79
  19. 72
  20. 38
  21. 76
  22. 84
  23. 87
  24. 70
  25. 41
  26. 81
  27. 33
  28. 43
  29. 16
  30. 29
  31. 66
  32. 17
  33. 32
  34. 80
  35. 12
  36. 27
  37. 86
  38. 59
  39. 28
  40. 56

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