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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 990 · 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. 1.11 + ? = 100
  2. 2.77 + ? = 100
  3. 3.1 + ? = 10
  4. 4.57 + ? = 100
  5. 5.88 + ? = 100
  6. 6.18 + ? = 100
  7. 7.2 + ? = 10
  8. 8.14 + ? = 100
  9. 9.9 + ? = 10
  10. 10.76 + ? = 100
  11. 11.19 + ? = 100
  12. 12.51 + ? = 100
  13. 13.85 + ? = 100
  14. 14.7 + ? = 10
  15. 15.44 + ? = 100
  16. 16.8 + ? = 10
  17. 17.82 + ? = 100
  18. 18.3 + ? = 10
  19. 19.79 + ? = 100
  20. 20.49 + ? = 100
  21. 21.63 + ? = 100
  22. 22.55 + ? = 100
  23. 23.80 + ? = 100
  24. 24.4 + ? = 10
  25. 25.16 + ? = 100
  26. 26.84 + ? = 100
  27. 27.52 + ? = 100
  28. 28.12 + ? = 100
  29. 29.15 + ? = 100
  30. 30.30 + ? = 100
  31. 31.23 + ? = 100
  32. 32.72 + ? = 100
  33. 33.75 + ? = 100
  34. 34.29 + ? = 100
  35. 35.22 + ? = 100
  36. 36.62 + ? = 100
  37. 37.71 + ? = 100
  38. 38.6 + ? = 10
  39. 39.59 + ? = 100
  40. 40.81 + ? = 100

Answer key

  1. 89
  2. 23
  3. 9
  4. 43
  5. 12
  6. 82
  7. 8
  8. 86
  9. 1
  10. 24
  11. 81
  12. 49
  13. 15
  14. 3
  15. 56
  16. 2
  17. 18
  18. 7
  19. 21
  20. 51
  21. 37
  22. 45
  23. 20
  24. 6
  25. 84
  26. 16
  27. 48
  28. 88
  29. 85
  30. 70
  31. 77
  32. 28
  33. 25
  34. 71
  35. 78
  36. 38
  37. 29
  38. 4
  39. 41
  40. 19

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