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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 564 · 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 39 =
  2. 2.Half of 194 =
  3. 3.Double 52 =
  4. 4.Double 91 =
  5. 5.Double 97 =
  6. 6.Double 66 =
  7. 7.Double 23 =
  8. 8.Double 71 =
  9. 9.Half of 40 =
  10. 10.Half of 144 =
  11. 11.Double 76 =
  12. 12.Double 41 =
  13. 13.Half of 76 =
  14. 14.Double 51 =
  15. 15.Half of 162 =
  16. 16.Double 19 =
  17. 17.Half of 108 =
  18. 18.Half of 92 =
  19. 19.Half of 140 =
  20. 20.Half of 132 =
  21. 21.Double 85 =
  22. 22.Half of 88 =
  23. 23.Half of 102 =
  24. 24.Half of 192 =
  25. 25.Double 73 =
  26. 26.Half of 186 =
  27. 27.Double 58 =
  28. 28.Half of 190 =
  29. 29.Double 94 =
  30. 30.Double 22 =
  31. 31.Double 34 =
  32. 32.Double 81 =
  33. 33.Half of 130 =
  34. 34.Half of 36 =
  35. 35.Half of 46 =
  36. 36.Half of 74 =
  37. 37.Double 74 =
  38. 38.Double 24 =
  39. 39.Half of 54 =
  40. 40.Half of 100 =

Answer key

  1. 78
  2. 97
  3. 104
  4. 182
  5. 194
  6. 132
  7. 46
  8. 142
  9. 20
  10. 72
  11. 152
  12. 82
  13. 38
  14. 102
  15. 81
  16. 38
  17. 54
  18. 46
  19. 70
  20. 66
  21. 170
  22. 44
  23. 51
  24. 96
  25. 146
  26. 93
  27. 116
  28. 95
  29. 188
  30. 44
  31. 68
  32. 162
  33. 65
  34. 18
  35. 23
  36. 37
  37. 148
  38. 48
  39. 27
  40. 50

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