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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 437 · 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. 1.8 + ? = 10
  2. 2.7 + ? = 10
  3. 3.4 + ? = 10
  4. 4.9 + ? = 10
  5. 5.68 + ? = 100
  6. 6.84 + ? = 100
  7. 7.3 + ? = 10
  8. 8.79 + ? = 100
  9. 9.51 + ? = 100
  10. 10.31 + ? = 100
  11. 11.43 + ? = 100
  12. 12.5 + ? = 10
  13. 13.83 + ? = 100
  14. 14.22 + ? = 100
  15. 15.35 + ? = 100
  16. 16.47 + ? = 100
  17. 17.1 + ? = 10
  18. 18.38 + ? = 100
  19. 19.15 + ? = 100
  20. 20.80 + ? = 100
  21. 21.24 + ? = 100
  22. 22.69 + ? = 100
  23. 23.74 + ? = 100
  24. 24.36 + ? = 100
  25. 25.6 + ? = 10
  26. 26.71 + ? = 100
  27. 27.49 + ? = 100
  28. 28.32 + ? = 100
  29. 29.28 + ? = 100
  30. 30.29 + ? = 100
  31. 31.34 + ? = 100
  32. 32.55 + ? = 100
  33. 33.45 + ? = 100
  34. 34.44 + ? = 100
  35. 35.20 + ? = 100
  36. 36.2 + ? = 10
  37. 37.25 + ? = 100
  38. 38.48 + ? = 100
  39. 39.41 + ? = 100
  40. 40.63 + ? = 100

Answer key

  1. 2
  2. 3
  3. 6
  4. 1
  5. 32
  6. 16
  7. 7
  8. 21
  9. 49
  10. 69
  11. 57
  12. 5
  13. 17
  14. 78
  15. 65
  16. 53
  17. 9
  18. 62
  19. 85
  20. 20
  21. 76
  22. 31
  23. 26
  24. 64
  25. 4
  26. 29
  27. 51
  28. 68
  29. 72
  30. 71
  31. 66
  32. 45
  33. 55
  34. 56
  35. 80
  36. 8
  37. 75
  38. 52
  39. 59
  40. 37

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