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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 876 · 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. 1.6 + ? = 10
  2. 2.45 + ? = 100
  3. 3.77 + ? = 100
  4. 4.8 + ? = 10
  5. 5.55 + ? = 100
  6. 6.9 + ? = 10
  7. 7.39 + ? = 100
  8. 8.21 + ? = 100
  9. 9.2 + ? = 10
  10. 10.11 + ? = 100
  11. 11.43 + ? = 100
  12. 12.1 + ? = 10
  13. 13.36 + ? = 100
  14. 14.73 + ? = 100
  15. 15.4 + ? = 10
  16. 16.18 + ? = 100
  17. 17.16 + ? = 100
  18. 18.62 + ? = 100
  19. 19.57 + ? = 100
  20. 20.13 + ? = 100
  21. 21.5 + ? = 10
  22. 22.3 + ? = 10
  23. 23.7 + ? = 10
  24. 24.49 + ? = 100
  25. 25.20 + ? = 100
  26. 26.63 + ? = 100
  27. 27.50 + ? = 100
  28. 28.61 + ? = 100
  29. 29.72 + ? = 100
  30. 30.83 + ? = 100
  31. 31.47 + ? = 100
  32. 32.65 + ? = 100
  33. 33.48 + ? = 100
  34. 34.25 + ? = 100
  35. 35.37 + ? = 100
  36. 36.15 + ? = 100
  37. 37.52 + ? = 100
  38. 38.46 + ? = 100
  39. 39.38 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 4
  2. 55
  3. 23
  4. 2
  5. 45
  6. 1
  7. 61
  8. 79
  9. 8
  10. 89
  11. 57
  12. 9
  13. 64
  14. 27
  15. 6
  16. 82
  17. 84
  18. 38
  19. 43
  20. 87
  21. 5
  22. 7
  23. 3
  24. 51
  25. 80
  26. 37
  27. 50
  28. 39
  29. 28
  30. 17
  31. 53
  32. 35
  33. 52
  34. 75
  35. 63
  36. 85
  37. 48
  38. 54
  39. 62
  40. 60

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