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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 875 · 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. 1.49 + ? = 100
  2. 2.88 + ? = 100
  3. 3.48 + ? = 100
  4. 4.6 + ? = 10
  5. 5.4 + ? = 10
  6. 6.5 + ? = 10
  7. 7.66 + ? = 100
  8. 8.13 + ? = 100
  9. 9.7 + ? = 10
  10. 10.53 + ? = 100
  11. 11.2 + ? = 10
  12. 12.61 + ? = 100
  13. 13.30 + ? = 100
  14. 14.68 + ? = 100
  15. 15.76 + ? = 100
  16. 16.15 + ? = 100
  17. 17.8 + ? = 10
  18. 18.79 + ? = 100
  19. 19.51 + ? = 100
  20. 20.3 + ? = 10
  21. 21.33 + ? = 100
  22. 22.21 + ? = 100
  23. 23.57 + ? = 100
  24. 24.11 + ? = 100
  25. 25.31 + ? = 100
  26. 26.43 + ? = 100
  27. 27.1 + ? = 10
  28. 28.20 + ? = 100
  29. 29.9 + ? = 10
  30. 30.24 + ? = 100
  31. 31.74 + ? = 100
  32. 32.17 + ? = 100
  33. 33.59 + ? = 100
  34. 34.72 + ? = 100
  35. 35.64 + ? = 100
  36. 36.50 + ? = 100
  37. 37.39 + ? = 100
  38. 38.45 + ? = 100
  39. 39.67 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 51
  2. 12
  3. 52
  4. 4
  5. 6
  6. 5
  7. 34
  8. 87
  9. 3
  10. 47
  11. 8
  12. 39
  13. 70
  14. 32
  15. 24
  16. 85
  17. 2
  18. 21
  19. 49
  20. 7
  21. 67
  22. 79
  23. 43
  24. 89
  25. 69
  26. 57
  27. 9
  28. 80
  29. 1
  30. 76
  31. 26
  32. 83
  33. 41
  34. 28
  35. 36
  36. 50
  37. 61
  38. 55
  39. 33
  40. 22

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