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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 336 · 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 17 =
  2. 2.Half of 28 =
  3. 3.Double 71 =
  4. 4.Double 26 =
  5. 5.Double 78 =
  6. 6.Double 32 =
  7. 7.Half of 108 =
  8. 8.Half of 184 =
  9. 9.Double 45 =
  10. 10.Half of 112 =
  11. 11.Double 19 =
  12. 12.Half of 88 =
  13. 13.Double 16 =
  14. 14.Double 93 =
  15. 15.Half of 44 =
  16. 16.Half of 72 =
  17. 17.Half of 102 =
  18. 18.Half of 74 =
  19. 19.Half of 98 =
  20. 20.Double 24 =
  21. 21.Half of 60 =
  22. 22.Half of 152 =
  23. 23.Half of 110 =
  24. 24.Double 76 =
  25. 25.Double 27 =
  26. 26.Double 82 =
  27. 27.Double 51 =
  28. 28.Half of 48 =
  29. 29.Double 96 =
  30. 30.Double 49 =
  31. 31.Double 38 =
  32. 32.Double 31 =
  33. 33.Double 67 =
  34. 34.Half of 162 =
  35. 35.Double 23 =
  36. 36.Double 43 =
  37. 37.Double 66 =
  38. 38.Half of 156 =
  39. 39.Half of 46 =
  40. 40.Double 92 =

Answer key

  1. 34
  2. 14
  3. 142
  4. 52
  5. 156
  6. 64
  7. 54
  8. 92
  9. 90
  10. 56
  11. 38
  12. 44
  13. 32
  14. 186
  15. 22
  16. 36
  17. 51
  18. 37
  19. 49
  20. 48
  21. 30
  22. 76
  23. 55
  24. 152
  25. 54
  26. 164
  27. 102
  28. 24
  29. 192
  30. 98
  31. 76
  32. 62
  33. 134
  34. 81
  35. 46
  36. 86
  37. 132
  38. 78
  39. 23
  40. 184

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