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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 823 · 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. 2.4 + ? = 10
  3. 3.34 + ? = 100
  4. 4.2 + ? = 10
  5. 5.1 + ? = 10
  6. 6.56 + ? = 100
  7. 7.7 + ? = 10
  8. 8.9 + ? = 10
  9. 9.25 + ? = 100
  10. 10.44 + ? = 100
  11. 11.3 + ? = 10
  12. 12.53 + ? = 100
  13. 13.69 + ? = 100
  14. 14.6 + ? = 10
  15. 15.89 + ? = 100
  16. 16.8 + ? = 10
  17. 17.75 + ? = 100
  18. 18.49 + ? = 100
  19. 19.16 + ? = 100
  20. 20.77 + ? = 100
  21. 21.21 + ? = 100
  22. 22.50 + ? = 100
  23. 23.66 + ? = 100
  24. 24.19 + ? = 100
  25. 25.61 + ? = 100
  26. 26.68 + ? = 100
  27. 27.65 + ? = 100
  28. 28.39 + ? = 100
  29. 29.57 + ? = 100
  30. 30.73 + ? = 100
  31. 31.26 + ? = 100
  32. 32.87 + ? = 100
  33. 33.67 + ? = 100
  34. 34.23 + ? = 100
  35. 35.47 + ? = 100
  36. 36.51 + ? = 100
  37. 37.62 + ? = 100
  38. 38.60 + ? = 100
  39. 39.59 + ? = 100
  40. 40.70 + ? = 100

Answer key

  1. 5
  2. 6
  3. 66
  4. 8
  5. 9
  6. 44
  7. 3
  8. 1
  9. 75
  10. 56
  11. 7
  12. 47
  13. 31
  14. 4
  15. 11
  16. 2
  17. 25
  18. 51
  19. 84
  20. 23
  21. 79
  22. 50
  23. 34
  24. 81
  25. 39
  26. 32
  27. 35
  28. 61
  29. 43
  30. 27
  31. 74
  32. 13
  33. 33
  34. 77
  35. 53
  36. 49
  37. 38
  38. 40
  39. 41
  40. 30

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