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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 958 · 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. 1.34 + ? = 100
  2. 2.4 + ? = 10
  3. 3.9 + ? = 10
  4. 4.30 + ? = 100
  5. 5.51 + ? = 100
  6. 6.11 + ? = 100
  7. 7.7 + ? = 10
  8. 8.8 + ? = 10
  9. 9.52 + ? = 100
  10. 10.64 + ? = 100
  11. 11.6 + ? = 10
  12. 12.54 + ? = 100
  13. 13.44 + ? = 100
  14. 14.28 + ? = 100
  15. 15.87 + ? = 100
  16. 16.14 + ? = 100
  17. 17.70 + ? = 100
  18. 18.3 + ? = 10
  19. 19.16 + ? = 100
  20. 20.1 + ? = 10
  21. 21.24 + ? = 100
  22. 22.63 + ? = 100
  23. 23.12 + ? = 100
  24. 24.85 + ? = 100
  25. 25.58 + ? = 100
  26. 26.2 + ? = 10
  27. 27.31 + ? = 100
  28. 28.15 + ? = 100
  29. 29.56 + ? = 100
  30. 30.80 + ? = 100
  31. 31.5 + ? = 10
  32. 32.57 + ? = 100
  33. 33.20 + ? = 100
  34. 34.45 + ? = 100
  35. 35.25 + ? = 100
  36. 36.86 + ? = 100
  37. 37.55 + ? = 100
  38. 38.75 + ? = 100
  39. 39.82 + ? = 100
  40. 40.27 + ? = 100

Answer key

  1. 66
  2. 6
  3. 1
  4. 70
  5. 49
  6. 89
  7. 3
  8. 2
  9. 48
  10. 36
  11. 4
  12. 46
  13. 56
  14. 72
  15. 13
  16. 86
  17. 30
  18. 7
  19. 84
  20. 9
  21. 76
  22. 37
  23. 88
  24. 15
  25. 42
  26. 8
  27. 69
  28. 85
  29. 44
  30. 20
  31. 5
  32. 43
  33. 80
  34. 55
  35. 75
  36. 14
  37. 45
  38. 25
  39. 18
  40. 73

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