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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 598 · 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 82 =
  2. 2.Double 16 =
  3. 3.Double 56 =
  4. 4.Double 55 =
  5. 5.Half of 68 =
  6. 6.Double 34 =
  7. 7.Double 43 =
  8. 8.Half of 70 =
  9. 9.Double 24 =
  10. 10.Half of 72 =
  11. 11.Double 93 =
  12. 12.Half of 112 =
  13. 13.Double 31 =
  14. 14.Double 84 =
  15. 15.Half of 32 =
  16. 16.Double 49 =
  17. 17.Half of 50 =
  18. 18.Half of 172 =
  19. 19.Half of 96 =
  20. 20.Double 92 =
  21. 21.Double 32 =
  22. 22.Half of 166 =
  23. 23.Double 69 =
  24. 24.Half of 120 =
  25. 25.Half of 158 =
  26. 26.Double 91 =
  27. 27.Half of 78 =
  28. 28.Half of 62 =
  29. 29.Double 71 =
  30. 30.Double 28 =
  31. 31.Double 88 =
  32. 32.Half of 94 =
  33. 33.Half of 194 =
  34. 34.Half of 46 =
  35. 35.Half of 34 =
  36. 36.Double 67 =
  37. 37.Half of 152 =
  38. 38.Double 96 =
  39. 39.Double 19 =
  40. 40.Double 35 =

Answer key

  1. 164
  2. 32
  3. 112
  4. 110
  5. 34
  6. 68
  7. 86
  8. 35
  9. 48
  10. 36
  11. 186
  12. 56
  13. 62
  14. 168
  15. 16
  16. 98
  17. 25
  18. 86
  19. 48
  20. 184
  21. 64
  22. 83
  23. 138
  24. 60
  25. 79
  26. 182
  27. 39
  28. 31
  29. 142
  30. 56
  31. 176
  32. 47
  33. 97
  34. 23
  35. 17
  36. 134
  37. 76
  38. 192
  39. 38
  40. 70

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