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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 295 · 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.Double 78 =
  2. 2.Half of 192 =
  3. 3.Half of 104 =
  4. 4.Half of 92 =
  5. 5.Double 81 =
  6. 6.Double 86 =
  7. 7.Half of 182 =
  8. 8.Double 85 =
  9. 9.Half of 140 =
  10. 10.Half of 56 =
  11. 11.Half of 74 =
  12. 12.Half of 54 =
  13. 13.Half of 170 =
  14. 14.Double 23 =
  15. 15.Half of 26 =
  16. 16.Double 47 =
  17. 17.Double 69 =
  18. 18.Double 82 =
  19. 19.Half of 144 =
  20. 20.Double 58 =
  21. 21.Half of 116 =
  22. 22.Half of 64 =
  23. 23.Double 28 =
  24. 24.Half of 122 =
  25. 25.Half of 176 =
  26. 26.Double 46 =
  27. 27.Half of 132 =
  28. 28.Double 16 =
  29. 29.Half of 28 =
  30. 30.Double 91 =
  31. 31.Half of 66 =
  32. 32.Half of 188 =
  33. 33.Double 33 =
  34. 34.Double 44 =
  35. 35.Half of 196 =
  36. 36.Half of 100 =
  37. 37.Half of 34 =
  38. 38.Double 61 =
  39. 39.Half of 156 =
  40. 40.Double 64 =

Answer key

  1. 156
  2. 96
  3. 52
  4. 46
  5. 162
  6. 172
  7. 91
  8. 170
  9. 70
  10. 28
  11. 37
  12. 27
  13. 85
  14. 46
  15. 13
  16. 94
  17. 138
  18. 164
  19. 72
  20. 116
  21. 58
  22. 32
  23. 56
  24. 61
  25. 88
  26. 92
  27. 66
  28. 32
  29. 14
  30. 182
  31. 33
  32. 94
  33. 66
  34. 88
  35. 98
  36. 50
  37. 17
  38. 122
  39. 78
  40. 128

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