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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 225 · 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 23 =
  2. 2.Half of 138 =
  3. 3.Half of 164 =
  4. 4.Double 68 =
  5. 5.Double 24 =
  6. 6.Half of 56 =
  7. 7.Double 54 =
  8. 8.Double 63 =
  9. 9.Double 81 =
  10. 10.Double 36 =
  11. 11.Half of 34 =
  12. 12.Double 98 =
  13. 13.Half of 36 =
  14. 14.Half of 130 =
  15. 15.Double 16 =
  16. 16.Double 69 =
  17. 17.Double 31 =
  18. 18.Half of 26 =
  19. 19.Double 78 =
  20. 20.Double 49 =
  21. 21.Half of 84 =
  22. 22.Half of 134 =
  23. 23.Double 18 =
  24. 24.Double 94 =
  25. 25.Double 95 =
  26. 26.Double 66 =
  27. 27.Half of 124 =
  28. 28.Double 97 =
  29. 29.Half of 54 =
  30. 30.Double 86 =
  31. 31.Double 38 =
  32. 32.Double 79 =
  33. 33.Half of 42 =
  34. 34.Double 35 =
  35. 35.Half of 38 =
  36. 36.Half of 146 =
  37. 37.Double 65 =
  38. 38.Half of 62 =
  39. 39.Half of 72 =
  40. 40.Double 26 =

Answer key

  1. 46
  2. 69
  3. 82
  4. 136
  5. 48
  6. 28
  7. 108
  8. 126
  9. 162
  10. 72
  11. 17
  12. 196
  13. 18
  14. 65
  15. 32
  16. 138
  17. 62
  18. 13
  19. 156
  20. 98
  21. 42
  22. 67
  23. 36
  24. 188
  25. 190
  26. 132
  27. 62
  28. 194
  29. 27
  30. 172
  31. 76
  32. 158
  33. 21
  34. 70
  35. 19
  36. 73
  37. 130
  38. 31
  39. 36
  40. 52

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