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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 541 · 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. 1.9 + ? = 10
  2. 2.5 + ? = 10
  3. 3.15 + ? = 100
  4. 4.11 + ? = 100
  5. 5.46 + ? = 100
  6. 6.38 + ? = 100
  7. 7.57 + ? = 100
  8. 8.4 + ? = 10
  9. 9.1 + ? = 10
  10. 10.56 + ? = 100
  11. 11.71 + ? = 100
  12. 12.7 + ? = 10
  13. 13.8 + ? = 10
  14. 14.62 + ? = 100
  15. 15.6 + ? = 10
  16. 16.66 + ? = 100
  17. 17.22 + ? = 100
  18. 18.60 + ? = 100
  19. 19.2 + ? = 10
  20. 20.37 + ? = 100
  21. 21.72 + ? = 100
  22. 22.14 + ? = 100
  23. 23.87 + ? = 100
  24. 24.84 + ? = 100
  25. 25.12 + ? = 100
  26. 26.45 + ? = 100
  27. 27.54 + ? = 100
  28. 28.3 + ? = 10
  29. 29.76 + ? = 100
  30. 30.31 + ? = 100
  31. 31.25 + ? = 100
  32. 32.34 + ? = 100
  33. 33.39 + ? = 100
  34. 34.40 + ? = 100
  35. 35.27 + ? = 100
  36. 36.48 + ? = 100
  37. 37.52 + ? = 100
  38. 38.80 + ? = 100
  39. 39.23 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 1
  2. 5
  3. 85
  4. 89
  5. 54
  6. 62
  7. 43
  8. 6
  9. 9
  10. 44
  11. 29
  12. 3
  13. 2
  14. 38
  15. 4
  16. 34
  17. 78
  18. 40
  19. 8
  20. 63
  21. 28
  22. 86
  23. 13
  24. 16
  25. 88
  26. 55
  27. 46
  28. 7
  29. 24
  30. 69
  31. 75
  32. 66
  33. 61
  34. 60
  35. 73
  36. 52
  37. 48
  38. 20
  39. 77
  40. 56

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