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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 840 · 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. 1.20 + ? = 100
  2. 2.9 + ? = 10
  3. 3.57 + ? = 100
  4. 4.71 + ? = 100
  5. 5.8 + ? = 10
  6. 6.16 + ? = 100
  7. 7.82 + ? = 100
  8. 8.89 + ? = 100
  9. 9.4 + ? = 10
  10. 10.5 + ? = 10
  11. 11.25 + ? = 100
  12. 12.6 + ? = 10
  13. 13.23 + ? = 100
  14. 14.28 + ? = 100
  15. 15.66 + ? = 100
  16. 16.1 + ? = 10
  17. 17.84 + ? = 100
  18. 18.3 + ? = 10
  19. 19.33 + ? = 100
  20. 20.27 + ? = 100
  21. 21.11 + ? = 100
  22. 22.32 + ? = 100
  23. 23.12 + ? = 100
  24. 24.29 + ? = 100
  25. 25.68 + ? = 100
  26. 26.2 + ? = 10
  27. 27.74 + ? = 100
  28. 28.19 + ? = 100
  29. 29.21 + ? = 100
  30. 30.35 + ? = 100
  31. 31.63 + ? = 100
  32. 32.77 + ? = 100
  33. 33.80 + ? = 100
  34. 34.87 + ? = 100
  35. 35.24 + ? = 100
  36. 36.76 + ? = 100
  37. 37.15 + ? = 100
  38. 38.60 + ? = 100
  39. 39.75 + ? = 100
  40. 40.72 + ? = 100

Answer key

  1. 80
  2. 1
  3. 43
  4. 29
  5. 2
  6. 84
  7. 18
  8. 11
  9. 6
  10. 5
  11. 75
  12. 4
  13. 77
  14. 72
  15. 34
  16. 9
  17. 16
  18. 7
  19. 67
  20. 73
  21. 89
  22. 68
  23. 88
  24. 71
  25. 32
  26. 8
  27. 26
  28. 81
  29. 79
  30. 65
  31. 37
  32. 23
  33. 20
  34. 13
  35. 76
  36. 24
  37. 85
  38. 40
  39. 25
  40. 28

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