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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 6 · 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. 1.5 + ? = 10
  2. 2.2 + ? = 10
  3. 3.3 + ? = 10
  4. 4.37 + ? = 100
  5. 5.78 + ? = 100
  6. 6.71 + ? = 100
  7. 7.84 + ? = 100
  8. 8.4 + ? = 10
  9. 9.88 + ? = 100
  10. 10.18 + ? = 100
  11. 11.45 + ? = 100
  12. 12.89 + ? = 100
  13. 13.9 + ? = 10
  14. 14.38 + ? = 100
  15. 15.29 + ? = 100
  16. 16.57 + ? = 100
  17. 17.40 + ? = 100
  18. 18.49 + ? = 100
  19. 19.15 + ? = 100
  20. 20.8 + ? = 10
  21. 21.34 + ? = 100
  22. 22.26 + ? = 100
  23. 23.58 + ? = 100
  24. 24.7 + ? = 10
  25. 25.51 + ? = 100
  26. 26.73 + ? = 100
  27. 27.35 + ? = 100
  28. 28.60 + ? = 100
  29. 29.80 + ? = 100
  30. 30.63 + ? = 100
  31. 31.6 + ? = 10
  32. 32.68 + ? = 100
  33. 33.74 + ? = 100
  34. 34.43 + ? = 100
  35. 35.27 + ? = 100
  36. 36.36 + ? = 100
  37. 37.55 + ? = 100
  38. 38.44 + ? = 100
  39. 39.42 + ? = 100
  40. 40.1 + ? = 10

Answer key

  1. 5
  2. 8
  3. 7
  4. 63
  5. 22
  6. 29
  7. 16
  8. 6
  9. 12
  10. 82
  11. 55
  12. 11
  13. 1
  14. 62
  15. 71
  16. 43
  17. 60
  18. 51
  19. 85
  20. 2
  21. 66
  22. 74
  23. 42
  24. 3
  25. 49
  26. 27
  27. 65
  28. 40
  29. 20
  30. 37
  31. 4
  32. 32
  33. 26
  34. 57
  35. 73
  36. 64
  37. 45
  38. 56
  39. 58
  40. 9

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