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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 971 · 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. 1.1 + ? = 10
  2. 2.51 + ? = 100
  3. 3.47 + ? = 100
  4. 4.78 + ? = 100
  5. 5.48 + ? = 100
  6. 6.4 + ? = 10
  7. 7.3 + ? = 10
  8. 8.8 + ? = 10
  9. 9.2 + ? = 10
  10. 10.9 + ? = 10
  11. 11.88 + ? = 100
  12. 12.5 + ? = 10
  13. 13.84 + ? = 100
  14. 14.53 + ? = 100
  15. 15.49 + ? = 100
  16. 16.21 + ? = 100
  17. 17.6 + ? = 10
  18. 18.18 + ? = 100
  19. 19.68 + ? = 100
  20. 20.67 + ? = 100
  21. 21.61 + ? = 100
  22. 22.57 + ? = 100
  23. 23.7 + ? = 10
  24. 24.76 + ? = 100
  25. 25.46 + ? = 100
  26. 26.28 + ? = 100
  27. 27.13 + ? = 100
  28. 28.17 + ? = 100
  29. 29.80 + ? = 100
  30. 30.30 + ? = 100
  31. 31.40 + ? = 100
  32. 32.32 + ? = 100
  33. 33.64 + ? = 100
  34. 34.39 + ? = 100
  35. 35.16 + ? = 100
  36. 36.34 + ? = 100
  37. 37.70 + ? = 100
  38. 38.89 + ? = 100
  39. 39.15 + ? = 100
  40. 40.54 + ? = 100

Answer key

  1. 9
  2. 49
  3. 53
  4. 22
  5. 52
  6. 6
  7. 7
  8. 2
  9. 8
  10. 1
  11. 12
  12. 5
  13. 16
  14. 47
  15. 51
  16. 79
  17. 4
  18. 82
  19. 32
  20. 33
  21. 39
  22. 43
  23. 3
  24. 24
  25. 54
  26. 72
  27. 87
  28. 83
  29. 20
  30. 70
  31. 60
  32. 68
  33. 36
  34. 61
  35. 84
  36. 66
  37. 30
  38. 11
  39. 85
  40. 46

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