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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 378 · 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.Half of 148 =
  2. 2.Half of 36 =
  3. 3.Double 95 =
  4. 4.Double 81 =
  5. 5.Double 52 =
  6. 6.Half of 172 =
  7. 7.Double 72 =
  8. 8.Half of 66 =
  9. 9.Half of 140 =
  10. 10.Double 75 =
  11. 11.Double 79 =
  12. 12.Half of 26 =
  13. 13.Double 63 =
  14. 14.Half of 70 =
  15. 15.Double 38 =
  16. 16.Double 45 =
  17. 17.Half of 58 =
  18. 18.Double 36 =
  19. 19.Half of 110 =
  20. 20.Double 92 =
  21. 21.Double 85 =
  22. 22.Double 23 =
  23. 23.Half of 56 =
  24. 24.Half of 122 =
  25. 25.Half of 162 =
  26. 26.Double 16 =
  27. 27.Half of 72 =
  28. 28.Half of 76 =
  29. 29.Half of 134 =
  30. 30.Double 61 =
  31. 31.Double 99 =
  32. 32.Half of 192 =
  33. 33.Double 65 =
  34. 34.Half of 52 =
  35. 35.Half of 62 =
  36. 36.Half of 96 =
  37. 37.Double 21 =
  38. 38.Half of 124 =
  39. 39.Double 22 =
  40. 40.Double 43 =

Answer key

  1. 74
  2. 18
  3. 190
  4. 162
  5. 104
  6. 86
  7. 144
  8. 33
  9. 70
  10. 150
  11. 158
  12. 13
  13. 126
  14. 35
  15. 76
  16. 90
  17. 29
  18. 72
  19. 55
  20. 184
  21. 170
  22. 46
  23. 28
  24. 61
  25. 81
  26. 32
  27. 36
  28. 38
  29. 67
  30. 122
  31. 198
  32. 96
  33. 130
  34. 26
  35. 31
  36. 48
  37. 42
  38. 62
  39. 44
  40. 86

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