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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 806 · 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 38 =
  2. 2.Half of 36 =
  3. 3.Half of 128 =
  4. 4.Half of 26 =
  5. 5.Half of 148 =
  6. 6.Double 51 =
  7. 7.Double 89 =
  8. 8.Half of 28 =
  9. 9.Double 91 =
  10. 10.Half of 34 =
  11. 11.Double 76 =
  12. 12.Double 48 =
  13. 13.Double 69 =
  14. 14.Double 81 =
  15. 15.Double 75 =
  16. 16.Double 26 =
  17. 17.Half of 196 =
  18. 18.Double 82 =
  19. 19.Double 36 =
  20. 20.Half of 170 =
  21. 21.Half of 58 =
  22. 22.Half of 178 =
  23. 23.Half of 172 =
  24. 24.Double 49 =
  25. 25.Double 83 =
  26. 26.Double 47 =
  27. 27.Double 66 =
  28. 28.Half of 98 =
  29. 29.Half of 94 =
  30. 30.Double 72 =
  31. 31.Half of 192 =
  32. 32.Half of 176 =
  33. 33.Half of 146 =
  34. 34.Double 68 =
  35. 35.Double 99 =
  36. 36.Half of 68 =
  37. 37.Half of 164 =
  38. 38.Double 37 =
  39. 39.Double 59 =
  40. 40.Half of 46 =

Answer key

  1. 76
  2. 18
  3. 64
  4. 13
  5. 74
  6. 102
  7. 178
  8. 14
  9. 182
  10. 17
  11. 152
  12. 96
  13. 138
  14. 162
  15. 150
  16. 52
  17. 98
  18. 164
  19. 72
  20. 85
  21. 29
  22. 89
  23. 86
  24. 98
  25. 166
  26. 94
  27. 132
  28. 49
  29. 47
  30. 144
  31. 96
  32. 88
  33. 73
  34. 136
  35. 198
  36. 34
  37. 82
  38. 74
  39. 118
  40. 23

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