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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 311 · 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 55 =
  2. 2.Half of 72 =
  3. 3.Double 41 =
  4. 4.Half of 194 =
  5. 5.Double 81 =
  6. 6.Half of 42 =
  7. 7.Double 38 =
  8. 8.Half of 192 =
  9. 9.Double 31 =
  10. 10.Double 78 =
  11. 11.Double 71 =
  12. 12.Double 76 =
  13. 13.Double 48 =
  14. 14.Half of 182 =
  15. 15.Double 54 =
  16. 16.Double 56 =
  17. 17.Double 58 =
  18. 18.Half of 136 =
  19. 19.Half of 100 =
  20. 20.Half of 166 =
  21. 21.Half of 26 =
  22. 22.Half of 112 =
  23. 23.Half of 46 =
  24. 24.Double 43 =
  25. 25.Double 99 =
  26. 26.Half of 86 =
  27. 27.Half of 184 =
  28. 28.Double 95 =
  29. 29.Double 72 =
  30. 30.Half of 176 =
  31. 31.Double 98 =
  32. 32.Double 51 =
  33. 33.Double 87 =
  34. 34.Half of 180 =
  35. 35.Double 75 =
  36. 36.Double 34 =
  37. 37.Half of 146 =
  38. 38.Double 27 =
  39. 39.Half of 156 =
  40. 40.Half of 152 =

Answer key

  1. 110
  2. 36
  3. 82
  4. 97
  5. 162
  6. 21
  7. 76
  8. 96
  9. 62
  10. 156
  11. 142
  12. 152
  13. 96
  14. 91
  15. 108
  16. 112
  17. 116
  18. 68
  19. 50
  20. 83
  21. 13
  22. 56
  23. 23
  24. 86
  25. 198
  26. 43
  27. 92
  28. 190
  29. 144
  30. 88
  31. 196
  32. 102
  33. 174
  34. 90
  35. 150
  36. 68
  37. 73
  38. 54
  39. 78
  40. 76

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