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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 735 · 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. 1.35 + ? = 100
  2. 2.1 + ? = 10
  3. 3.5 + ? = 10
  4. 4.4 + ? = 10
  5. 5.23 + ? = 100
  6. 6.71 + ? = 100
  7. 7.9 + ? = 10
  8. 8.34 + ? = 100
  9. 9.7 + ? = 10
  10. 10.87 + ? = 100
  11. 11.3 + ? = 10
  12. 12.72 + ? = 100
  13. 13.22 + ? = 100
  14. 14.19 + ? = 100
  15. 15.21 + ? = 100
  16. 16.67 + ? = 100
  17. 17.37 + ? = 100
  18. 18.32 + ? = 100
  19. 19.49 + ? = 100
  20. 20.45 + ? = 100
  21. 21.84 + ? = 100
  22. 22.33 + ? = 100
  23. 23.65 + ? = 100
  24. 24.8 + ? = 10
  25. 25.80 + ? = 100
  26. 26.73 + ? = 100
  27. 27.70 + ? = 100
  28. 28.13 + ? = 100
  29. 29.74 + ? = 100
  30. 30.2 + ? = 10
  31. 31.64 + ? = 100
  32. 32.50 + ? = 100
  33. 33.16 + ? = 100
  34. 34.12 + ? = 100
  35. 35.25 + ? = 100
  36. 36.6 + ? = 10
  37. 37.62 + ? = 100
  38. 38.77 + ? = 100
  39. 39.68 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 65
  2. 9
  3. 5
  4. 6
  5. 77
  6. 29
  7. 1
  8. 66
  9. 3
  10. 13
  11. 7
  12. 28
  13. 78
  14. 81
  15. 79
  16. 33
  17. 63
  18. 68
  19. 51
  20. 55
  21. 16
  22. 67
  23. 35
  24. 2
  25. 20
  26. 27
  27. 30
  28. 87
  29. 26
  30. 8
  31. 36
  32. 50
  33. 84
  34. 88
  35. 75
  36. 4
  37. 38
  38. 23
  39. 32
  40. 74

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