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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 178 · 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 86 =
  2. 2.Double 43 =
  3. 3.Double 17 =
  4. 4.Half of 164 =
  5. 5.Half of 44 =
  6. 6.Double 71 =
  7. 7.Double 51 =
  8. 8.Double 96 =
  9. 9.Half of 166 =
  10. 10.Double 18 =
  11. 11.Half of 60 =
  12. 12.Double 28 =
  13. 13.Half of 120 =
  14. 14.Double 85 =
  15. 15.Half of 160 =
  16. 16.Half of 38 =
  17. 17.Half of 54 =
  18. 18.Double 75 =
  19. 19.Half of 30 =
  20. 20.Double 45 =
  21. 21.Double 68 =
  22. 22.Double 64 =
  23. 23.Half of 50 =
  24. 24.Half of 64 =
  25. 25.Double 31 =
  26. 26.Double 19 =
  27. 27.Double 72 =
  28. 28.Double 65 =
  29. 29.Half of 110 =
  30. 30.Double 69 =
  31. 31.Double 78 =
  32. 32.Double 92 =
  33. 33.Double 99 =
  34. 34.Half of 196 =
  35. 35.Half of 142 =
  36. 36.Half of 74 =
  37. 37.Half of 192 =
  38. 38.Half of 56 =
  39. 39.Half of 92 =
  40. 40.Half of 28 =

Answer key

  1. 172
  2. 86
  3. 34
  4. 82
  5. 22
  6. 142
  7. 102
  8. 192
  9. 83
  10. 36
  11. 30
  12. 56
  13. 60
  14. 170
  15. 80
  16. 19
  17. 27
  18. 150
  19. 15
  20. 90
  21. 136
  22. 128
  23. 25
  24. 32
  25. 62
  26. 38
  27. 144
  28. 130
  29. 55
  30. 138
  31. 156
  32. 184
  33. 198
  34. 98
  35. 71
  36. 37
  37. 96
  38. 28
  39. 46
  40. 14

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