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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 899 · 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. 1.47 + ? = 100
  2. 2.84 + ? = 100
  3. 3.9 + ? = 10
  4. 4.5 + ? = 10
  5. 5.3 + ? = 10
  6. 6.51 + ? = 100
  7. 7.6 + ? = 10
  8. 8.8 + ? = 10
  9. 9.44 + ? = 100
  10. 10.39 + ? = 100
  11. 11.80 + ? = 100
  12. 12.15 + ? = 100
  13. 13.14 + ? = 100
  14. 14.35 + ? = 100
  15. 15.57 + ? = 100
  16. 16.1 + ? = 10
  17. 17.30 + ? = 100
  18. 18.74 + ? = 100
  19. 19.78 + ? = 100
  20. 20.2 + ? = 10
  21. 21.58 + ? = 100
  22. 22.4 + ? = 10
  23. 23.53 + ? = 100
  24. 24.7 + ? = 10
  25. 25.86 + ? = 100
  26. 26.19 + ? = 100
  27. 27.43 + ? = 100
  28. 28.34 + ? = 100
  29. 29.71 + ? = 100
  30. 30.21 + ? = 100
  31. 31.18 + ? = 100
  32. 32.55 + ? = 100
  33. 33.68 + ? = 100
  34. 34.50 + ? = 100
  35. 35.88 + ? = 100
  36. 36.64 + ? = 100
  37. 37.82 + ? = 100
  38. 38.59 + ? = 100
  39. 39.22 + ? = 100
  40. 40.63 + ? = 100

Answer key

  1. 53
  2. 16
  3. 1
  4. 5
  5. 7
  6. 49
  7. 4
  8. 2
  9. 56
  10. 61
  11. 20
  12. 85
  13. 86
  14. 65
  15. 43
  16. 9
  17. 70
  18. 26
  19. 22
  20. 8
  21. 42
  22. 6
  23. 47
  24. 3
  25. 14
  26. 81
  27. 57
  28. 66
  29. 29
  30. 79
  31. 82
  32. 45
  33. 32
  34. 50
  35. 12
  36. 36
  37. 18
  38. 41
  39. 78
  40. 37

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