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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 940 · 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. 1.6 + ? = 10
  2. 2.3 + ? = 10
  3. 3.4 + ? = 10
  4. 4.8 + ? = 10
  5. 5.59 + ? = 100
  6. 6.9 + ? = 10
  7. 7.72 + ? = 100
  8. 8.1 + ? = 10
  9. 9.7 + ? = 10
  10. 10.63 + ? = 100
  11. 11.2 + ? = 10
  12. 12.37 + ? = 100
  13. 13.20 + ? = 100
  14. 14.76 + ? = 100
  15. 15.82 + ? = 100
  16. 16.24 + ? = 100
  17. 17.48 + ? = 100
  18. 18.42 + ? = 100
  19. 19.89 + ? = 100
  20. 20.44 + ? = 100
  21. 21.52 + ? = 100
  22. 22.29 + ? = 100
  23. 23.27 + ? = 100
  24. 24.86 + ? = 100
  25. 25.15 + ? = 100
  26. 26.5 + ? = 10
  27. 27.34 + ? = 100
  28. 28.35 + ? = 100
  29. 29.46 + ? = 100
  30. 30.88 + ? = 100
  31. 31.70 + ? = 100
  32. 32.21 + ? = 100
  33. 33.58 + ? = 100
  34. 34.85 + ? = 100
  35. 35.56 + ? = 100
  36. 36.17 + ? = 100
  37. 37.45 + ? = 100
  38. 38.30 + ? = 100
  39. 39.18 + ? = 100
  40. 40.87 + ? = 100

Answer key

  1. 4
  2. 7
  3. 6
  4. 2
  5. 41
  6. 1
  7. 28
  8. 9
  9. 3
  10. 37
  11. 8
  12. 63
  13. 80
  14. 24
  15. 18
  16. 76
  17. 52
  18. 58
  19. 11
  20. 56
  21. 48
  22. 71
  23. 73
  24. 14
  25. 85
  26. 5
  27. 66
  28. 65
  29. 54
  30. 12
  31. 30
  32. 79
  33. 42
  34. 15
  35. 44
  36. 83
  37. 55
  38. 70
  39. 82
  40. 13

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