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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 941 · 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. 2.7 + ? = 10
  3. 3.42 + ? = 100
  4. 4.9 + ? = 10
  5. 5.19 + ? = 100
  6. 6.49 + ? = 100
  7. 7.1 + ? = 10
  8. 8.51 + ? = 100
  9. 9.8 + ? = 10
  10. 10.33 + ? = 100
  11. 11.3 + ? = 10
  12. 12.40 + ? = 100
  13. 13.26 + ? = 100
  14. 14.45 + ? = 100
  15. 15.60 + ? = 100
  16. 16.47 + ? = 100
  17. 17.88 + ? = 100
  18. 18.6 + ? = 10
  19. 19.4 + ? = 10
  20. 20.24 + ? = 100
  21. 21.27 + ? = 100
  22. 22.35 + ? = 100
  23. 23.78 + ? = 100
  24. 24.81 + ? = 100
  25. 25.70 + ? = 100
  26. 26.22 + ? = 100
  27. 27.39 + ? = 100
  28. 28.50 + ? = 100
  29. 29.30 + ? = 100
  30. 30.73 + ? = 100
  31. 31.86 + ? = 100
  32. 32.11 + ? = 100
  33. 33.76 + ? = 100
  34. 34.14 + ? = 100
  35. 35.25 + ? = 100
  36. 36.21 + ? = 100
  37. 37.69 + ? = 100
  38. 38.54 + ? = 100
  39. 39.2 + ? = 10
  40. 40.89 + ? = 100

Answer key

  1. 5
  2. 3
  3. 58
  4. 1
  5. 81
  6. 51
  7. 9
  8. 49
  9. 2
  10. 67
  11. 7
  12. 60
  13. 74
  14. 55
  15. 40
  16. 53
  17. 12
  18. 4
  19. 6
  20. 76
  21. 73
  22. 65
  23. 22
  24. 19
  25. 30
  26. 78
  27. 61
  28. 50
  29. 70
  30. 27
  31. 14
  32. 89
  33. 24
  34. 86
  35. 75
  36. 79
  37. 31
  38. 46
  39. 8
  40. 11

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