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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 951 · 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. 1.56 + ? = 100
  2. 2.34 + ? = 100
  3. 3.1 + ? = 10
  4. 4.39 + ? = 100
  5. 5.28 + ? = 100
  6. 6.36 + ? = 100
  7. 7.15 + ? = 100
  8. 8.5 + ? = 10
  9. 9.22 + ? = 100
  10. 10.69 + ? = 100
  11. 11.21 + ? = 100
  12. 12.61 + ? = 100
  13. 13.6 + ? = 10
  14. 14.77 + ? = 100
  15. 15.89 + ? = 100
  16. 16.4 + ? = 10
  17. 17.54 + ? = 100
  18. 18.44 + ? = 100
  19. 19.19 + ? = 100
  20. 20.12 + ? = 100
  21. 21.2 + ? = 10
  22. 22.70 + ? = 100
  23. 23.82 + ? = 100
  24. 24.78 + ? = 100
  25. 25.64 + ? = 100
  26. 26.8 + ? = 10
  27. 27.31 + ? = 100
  28. 28.73 + ? = 100
  29. 29.86 + ? = 100
  30. 30.9 + ? = 10
  31. 31.48 + ? = 100
  32. 32.57 + ? = 100
  33. 33.63 + ? = 100
  34. 34.16 + ? = 100
  35. 35.53 + ? = 100
  36. 36.80 + ? = 100
  37. 37.7 + ? = 10
  38. 38.3 + ? = 10
  39. 39.20 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 44
  2. 66
  3. 9
  4. 61
  5. 72
  6. 64
  7. 85
  8. 5
  9. 78
  10. 31
  11. 79
  12. 39
  13. 4
  14. 23
  15. 11
  16. 6
  17. 46
  18. 56
  19. 81
  20. 88
  21. 8
  22. 30
  23. 18
  24. 22
  25. 36
  26. 2
  27. 69
  28. 27
  29. 14
  30. 1
  31. 52
  32. 43
  33. 37
  34. 84
  35. 47
  36. 20
  37. 3
  38. 7
  39. 80
  40. 24

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