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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 428 · 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. 1.1 + ? = 10
  2. 2.3 + ? = 10
  3. 3.55 + ? = 100
  4. 4.5 + ? = 10
  5. 5.66 + ? = 100
  6. 6.69 + ? = 100
  7. 7.32 + ? = 100
  8. 8.51 + ? = 100
  9. 9.56 + ? = 100
  10. 10.35 + ? = 100
  11. 11.28 + ? = 100
  12. 12.2 + ? = 10
  13. 13.38 + ? = 100
  14. 14.67 + ? = 100
  15. 15.84 + ? = 100
  16. 16.4 + ? = 10
  17. 17.15 + ? = 100
  18. 18.43 + ? = 100
  19. 19.53 + ? = 100
  20. 20.21 + ? = 100
  21. 21.11 + ? = 100
  22. 22.36 + ? = 100
  23. 23.26 + ? = 100
  24. 24.19 + ? = 100
  25. 25.76 + ? = 100
  26. 26.63 + ? = 100
  27. 27.8 + ? = 10
  28. 28.30 + ? = 100
  29. 29.7 + ? = 10
  30. 30.29 + ? = 100
  31. 31.9 + ? = 10
  32. 32.65 + ? = 100
  33. 33.54 + ? = 100
  34. 34.33 + ? = 100
  35. 35.64 + ? = 100
  36. 36.87 + ? = 100
  37. 37.41 + ? = 100
  38. 38.6 + ? = 10
  39. 39.83 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 9
  2. 7
  3. 45
  4. 5
  5. 34
  6. 31
  7. 68
  8. 49
  9. 44
  10. 65
  11. 72
  12. 8
  13. 62
  14. 33
  15. 16
  16. 6
  17. 85
  18. 57
  19. 47
  20. 79
  21. 89
  22. 64
  23. 74
  24. 81
  25. 24
  26. 37
  27. 2
  28. 70
  29. 3
  30. 71
  31. 1
  32. 35
  33. 46
  34. 67
  35. 36
  36. 13
  37. 59
  38. 4
  39. 17
  40. 48

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