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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 265 · 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 110 =
  3. 3.Double 27 =
  4. 4.Half of 134 =
  5. 5.Half of 178 =
  6. 6.Half of 124 =
  7. 7.Double 77 =
  8. 8.Half of 48 =
  9. 9.Half of 78 =
  10. 10.Half of 170 =
  11. 11.Half of 62 =
  12. 12.Double 82 =
  13. 13.Half of 44 =
  14. 14.Double 46 =
  15. 15.Double 16 =
  16. 16.Double 59 =
  17. 17.Double 47 =
  18. 18.Half of 46 =
  19. 19.Double 42 =
  20. 20.Double 88 =
  21. 21.Half of 166 =
  22. 22.Double 25 =
  23. 23.Double 38 =
  24. 24.Double 66 =
  25. 25.Half of 174 =
  26. 26.Half of 86 =
  27. 27.Double 87 =
  28. 28.Double 68 =
  29. 29.Half of 68 =
  30. 30.Double 44 =
  31. 31.Double 91 =
  32. 32.Double 97 =
  33. 33.Half of 154 =
  34. 34.Half of 192 =
  35. 35.Double 64 =
  36. 36.Double 18 =
  37. 37.Double 83 =
  38. 38.Double 72 =
  39. 39.Double 89 =
  40. 40.Half of 198 =

Answer key

  1. 74
  2. 55
  3. 54
  4. 67
  5. 89
  6. 62
  7. 154
  8. 24
  9. 39
  10. 85
  11. 31
  12. 164
  13. 22
  14. 92
  15. 32
  16. 118
  17. 94
  18. 23
  19. 84
  20. 176
  21. 83
  22. 50
  23. 76
  24. 132
  25. 87
  26. 43
  27. 174
  28. 136
  29. 34
  30. 88
  31. 182
  32. 194
  33. 77
  34. 96
  35. 128
  36. 36
  37. 166
  38. 144
  39. 178
  40. 99

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