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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 878 · 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. 1.2 + ? = 10
  2. 2.38 + ? = 100
  3. 3.68 + ? = 100
  4. 4.51 + ? = 100
  5. 5.65 + ? = 100
  6. 6.46 + ? = 100
  7. 7.62 + ? = 100
  8. 8.14 + ? = 100
  9. 9.11 + ? = 100
  10. 10.69 + ? = 100
  11. 11.29 + ? = 100
  12. 12.18 + ? = 100
  13. 13.64 + ? = 100
  14. 14.17 + ? = 100
  15. 15.85 + ? = 100
  16. 16.6 + ? = 10
  17. 17.79 + ? = 100
  18. 18.3 + ? = 10
  19. 19.76 + ? = 100
  20. 20.9 + ? = 10
  21. 21.27 + ? = 100
  22. 22.66 + ? = 100
  23. 23.77 + ? = 100
  24. 24.87 + ? = 100
  25. 25.7 + ? = 10
  26. 26.41 + ? = 100
  27. 27.37 + ? = 100
  28. 28.21 + ? = 100
  29. 29.32 + ? = 100
  30. 30.50 + ? = 100
  31. 31.23 + ? = 100
  32. 32.34 + ? = 100
  33. 33.8 + ? = 10
  34. 34.44 + ? = 100
  35. 35.12 + ? = 100
  36. 36.33 + ? = 100
  37. 37.4 + ? = 10
  38. 38.5 + ? = 10
  39. 39.1 + ? = 10
  40. 40.81 + ? = 100

Answer key

  1. 8
  2. 62
  3. 32
  4. 49
  5. 35
  6. 54
  7. 38
  8. 86
  9. 89
  10. 31
  11. 71
  12. 82
  13. 36
  14. 83
  15. 15
  16. 4
  17. 21
  18. 7
  19. 24
  20. 1
  21. 73
  22. 34
  23. 23
  24. 13
  25. 3
  26. 59
  27. 63
  28. 79
  29. 68
  30. 50
  31. 77
  32. 66
  33. 2
  34. 56
  35. 88
  36. 67
  37. 6
  38. 5
  39. 9
  40. 19

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