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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 256 · 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 19 =
  2. 2.Double 17 =
  3. 3.Double 21 =
  4. 4.Half of 126 =
  5. 5.Half of 118 =
  6. 6.Double 67 =
  7. 7.Double 58 =
  8. 8.Double 66 =
  9. 9.Half of 184 =
  10. 10.Half of 138 =
  11. 11.Double 65 =
  12. 12.Half of 198 =
  13. 13.Half of 76 =
  14. 14.Half of 176 =
  15. 15.Half of 166 =
  16. 16.Half of 146 =
  17. 17.Double 81 =
  18. 18.Half of 102 =
  19. 19.Half of 174 =
  20. 20.Double 76 =
  21. 21.Double 69 =
  22. 22.Half of 162 =
  23. 23.Double 82 =
  24. 24.Half of 124 =
  25. 25.Half of 196 =
  26. 26.Half of 96 =
  27. 27.Half of 52 =
  28. 28.Half of 122 =
  29. 29.Half of 32 =
  30. 30.Half of 74 =
  31. 31.Double 87 =
  32. 32.Half of 82 =
  33. 33.Double 99 =
  34. 34.Double 43 =
  35. 35.Half of 50 =
  36. 36.Half of 180 =
  37. 37.Double 93 =
  38. 38.Double 36 =
  39. 39.Double 83 =
  40. 40.Double 72 =

Answer key

  1. 38
  2. 34
  3. 42
  4. 63
  5. 59
  6. 134
  7. 116
  8. 132
  9. 92
  10. 69
  11. 130
  12. 99
  13. 38
  14. 88
  15. 83
  16. 73
  17. 162
  18. 51
  19. 87
  20. 152
  21. 138
  22. 81
  23. 164
  24. 62
  25. 98
  26. 48
  27. 26
  28. 61
  29. 16
  30. 37
  31. 174
  32. 41
  33. 198
  34. 86
  35. 25
  36. 90
  37. 186
  38. 72
  39. 166
  40. 144

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