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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 406 · 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 92 =
  2. 2.Double 48 =
  3. 3.Half of 134 =
  4. 4.Double 46 =
  5. 5.Double 38 =
  6. 6.Double 88 =
  7. 7.Double 29 =
  8. 8.Half of 62 =
  9. 9.Double 68 =
  10. 10.Double 35 =
  11. 11.Half of 194 =
  12. 12.Double 34 =
  13. 13.Double 27 =
  14. 14.Half of 72 =
  15. 15.Double 57 =
  16. 16.Double 84 =
  17. 17.Double 39 =
  18. 18.Half of 150 =
  19. 19.Double 96 =
  20. 20.Half of 58 =
  21. 21.Double 94 =
  22. 22.Half of 174 =
  23. 23.Double 18 =
  24. 24.Half of 148 =
  25. 25.Half of 70 =
  26. 26.Half of 132 =
  27. 27.Half of 96 =
  28. 28.Double 41 =
  29. 29.Half of 176 =
  30. 30.Half of 32 =
  31. 31.Half of 152 =
  32. 32.Double 98 =
  33. 33.Half of 30 =
  34. 34.Double 81 =
  35. 35.Double 43 =
  36. 36.Double 99 =
  37. 37.Half of 186 =
  38. 38.Half of 80 =
  39. 39.Double 78 =
  40. 40.Double 79 =

Answer key

  1. 184
  2. 96
  3. 67
  4. 92
  5. 76
  6. 176
  7. 58
  8. 31
  9. 136
  10. 70
  11. 97
  12. 68
  13. 54
  14. 36
  15. 114
  16. 168
  17. 78
  18. 75
  19. 192
  20. 29
  21. 188
  22. 87
  23. 36
  24. 74
  25. 35
  26. 66
  27. 48
  28. 82
  29. 88
  30. 16
  31. 76
  32. 196
  33. 15
  34. 162
  35. 86
  36. 198
  37. 93
  38. 40
  39. 156
  40. 158

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