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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 857 · 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. 1.29 + ? = 100
  2. 2.66 + ? = 100
  3. 3.1 + ? = 10
  4. 4.3 + ? = 10
  5. 5.5 + ? = 10
  6. 6.2 + ? = 10
  7. 7.9 + ? = 10
  8. 8.77 + ? = 100
  9. 9.7 + ? = 10
  10. 10.73 + ? = 100
  11. 11.11 + ? = 100
  12. 12.33 + ? = 100
  13. 13.40 + ? = 100
  14. 14.25 + ? = 100
  15. 15.4 + ? = 10
  16. 16.69 + ? = 100
  17. 17.89 + ? = 100
  18. 18.28 + ? = 100
  19. 19.14 + ? = 100
  20. 20.67 + ? = 100
  21. 21.21 + ? = 100
  22. 22.87 + ? = 100
  23. 23.15 + ? = 100
  24. 24.76 + ? = 100
  25. 25.27 + ? = 100
  26. 26.41 + ? = 100
  27. 27.6 + ? = 10
  28. 28.84 + ? = 100
  29. 29.52 + ? = 100
  30. 30.44 + ? = 100
  31. 31.65 + ? = 100
  32. 32.43 + ? = 100
  33. 33.60 + ? = 100
  34. 34.20 + ? = 100
  35. 35.19 + ? = 100
  36. 36.18 + ? = 100
  37. 37.50 + ? = 100
  38. 38.51 + ? = 100
  39. 39.8 + ? = 10
  40. 40.79 + ? = 100

Answer key

  1. 71
  2. 34
  3. 9
  4. 7
  5. 5
  6. 8
  7. 1
  8. 23
  9. 3
  10. 27
  11. 89
  12. 67
  13. 60
  14. 75
  15. 6
  16. 31
  17. 11
  18. 72
  19. 86
  20. 33
  21. 79
  22. 13
  23. 85
  24. 24
  25. 73
  26. 59
  27. 4
  28. 16
  29. 48
  30. 56
  31. 35
  32. 57
  33. 40
  34. 80
  35. 81
  36. 82
  37. 50
  38. 49
  39. 2
  40. 21

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