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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 979 · 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. 1.18 + ? = 100
  2. 2.2 + ? = 10
  3. 3.60 + ? = 100
  4. 4.5 + ? = 10
  5. 5.15 + ? = 100
  6. 6.73 + ? = 100
  7. 7.53 + ? = 100
  8. 8.77 + ? = 100
  9. 9.21 + ? = 100
  10. 10.7 + ? = 10
  11. 11.6 + ? = 10
  12. 12.71 + ? = 100
  13. 13.89 + ? = 100
  14. 14.80 + ? = 100
  15. 15.41 + ? = 100
  16. 16.67 + ? = 100
  17. 17.8 + ? = 10
  18. 18.26 + ? = 100
  19. 19.72 + ? = 100
  20. 20.1 + ? = 10
  21. 21.47 + ? = 100
  22. 22.87 + ? = 100
  23. 23.12 + ? = 100
  24. 24.23 + ? = 100
  25. 25.9 + ? = 10
  26. 26.20 + ? = 100
  27. 27.84 + ? = 100
  28. 28.11 + ? = 100
  29. 29.14 + ? = 100
  30. 30.4 + ? = 10
  31. 31.32 + ? = 100
  32. 32.81 + ? = 100
  33. 33.86 + ? = 100
  34. 34.55 + ? = 100
  35. 35.34 + ? = 100
  36. 36.74 + ? = 100
  37. 37.28 + ? = 100
  38. 38.3 + ? = 10
  39. 39.79 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 82
  2. 8
  3. 40
  4. 5
  5. 85
  6. 27
  7. 47
  8. 23
  9. 79
  10. 3
  11. 4
  12. 29
  13. 11
  14. 20
  15. 59
  16. 33
  17. 2
  18. 74
  19. 28
  20. 9
  21. 53
  22. 13
  23. 88
  24. 77
  25. 1
  26. 80
  27. 16
  28. 89
  29. 86
  30. 6
  31. 68
  32. 19
  33. 14
  34. 45
  35. 66
  36. 26
  37. 72
  38. 7
  39. 21
  40. 60

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