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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 106 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 126 =
  2. 2.Double 25 =
  3. 3.Half of 78 =
  4. 4.Half of 44 =
  5. 5.Half of 148 =
  6. 6.Half of 172 =
  7. 7.Half of 26 =
  8. 8.Half of 48 =
  9. 9.Double 31 =
  10. 10.Half of 106 =
  11. 11.Double 18 =
  12. 12.Half of 194 =
  13. 13.Double 88 =
  14. 14.Double 56 =
  15. 15.Double 55 =
  16. 16.Half of 34 =
  17. 17.Double 96 =
  18. 18.Double 17 =
  19. 19.Double 41 =
  20. 20.Double 47 =
  21. 21.Half of 170 =
  22. 22.Double 22 =
  23. 23.Double 26 =
  24. 24.Double 51 =
  25. 25.Half of 180 =
  26. 26.Double 52 =
  27. 27.Half of 176 =
  28. 28.Half of 184 =
  29. 29.Double 83 =
  30. 30.Half of 80 =
  31. 31.Half of 104 =
  32. 32.Half of 52 =
  33. 33.Double 32 =
  34. 34.Half of 178 =
  35. 35.Half of 120 =
  36. 36.Double 37 =
  37. 37.Half of 128 =
  38. 38.Double 27 =
  39. 39.Half of 158 =
  40. 40.Double 53 =

Answer key

  1. 63
  2. 50
  3. 39
  4. 22
  5. 74
  6. 86
  7. 13
  8. 24
  9. 62
  10. 53
  11. 36
  12. 97
  13. 176
  14. 112
  15. 110
  16. 17
  17. 192
  18. 34
  19. 82
  20. 94
  21. 85
  22. 44
  23. 52
  24. 102
  25. 90
  26. 104
  27. 88
  28. 92
  29. 166
  30. 40
  31. 52
  32. 26
  33. 64
  34. 89
  35. 60
  36. 74
  37. 64
  38. 54
  39. 79
  40. 106

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