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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 949 · 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. 1.7 + ? = 10
  2. 2.2 + ? = 10
  3. 3.60 + ? = 100
  4. 4.39 + ? = 100
  5. 5.35 + ? = 100
  6. 6.9 + ? = 10
  7. 7.1 + ? = 10
  8. 8.86 + ? = 100
  9. 9.5 + ? = 10
  10. 10.72 + ? = 100
  11. 11.17 + ? = 100
  12. 12.12 + ? = 100
  13. 13.21 + ? = 100
  14. 14.76 + ? = 100
  15. 15.56 + ? = 100
  16. 16.45 + ? = 100
  17. 17.8 + ? = 10
  18. 18.16 + ? = 100
  19. 19.4 + ? = 10
  20. 20.87 + ? = 100
  21. 21.85 + ? = 100
  22. 22.3 + ? = 10
  23. 23.69 + ? = 100
  24. 24.26 + ? = 100
  25. 25.40 + ? = 100
  26. 26.24 + ? = 100
  27. 27.55 + ? = 100
  28. 28.78 + ? = 100
  29. 29.28 + ? = 100
  30. 30.32 + ? = 100
  31. 31.6 + ? = 10
  32. 32.38 + ? = 100
  33. 33.81 + ? = 100
  34. 34.36 + ? = 100
  35. 35.64 + ? = 100
  36. 36.71 + ? = 100
  37. 37.74 + ? = 100
  38. 38.58 + ? = 100
  39. 39.83 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 3
  2. 8
  3. 40
  4. 61
  5. 65
  6. 1
  7. 9
  8. 14
  9. 5
  10. 28
  11. 83
  12. 88
  13. 79
  14. 24
  15. 44
  16. 55
  17. 2
  18. 84
  19. 6
  20. 13
  21. 15
  22. 7
  23. 31
  24. 74
  25. 60
  26. 76
  27. 45
  28. 22
  29. 72
  30. 68
  31. 4
  32. 62
  33. 19
  34. 64
  35. 36
  36. 29
  37. 26
  38. 42
  39. 17
  40. 56

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