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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 382 · 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 97 =
  2. 2.Double 68 =
  3. 3.Half of 168 =
  4. 4.Double 93 =
  5. 5.Double 34 =
  6. 6.Double 18 =
  7. 7.Double 88 =
  8. 8.Double 55 =
  9. 9.Half of 100 =
  10. 10.Half of 134 =
  11. 11.Half of 40 =
  12. 12.Double 59 =
  13. 13.Double 33 =
  14. 14.Double 43 =
  15. 15.Half of 70 =
  16. 16.Double 99 =
  17. 17.Half of 68 =
  18. 18.Half of 56 =
  19. 19.Half of 190 =
  20. 20.Half of 140 =
  21. 21.Half of 112 =
  22. 22.Double 32 =
  23. 23.Double 79 =
  24. 24.Double 26 =
  25. 25.Double 78 =
  26. 26.Double 27 =
  27. 27.Double 41 =
  28. 28.Double 54 =
  29. 29.Double 76 =
  30. 30.Double 86 =
  31. 31.Double 28 =
  32. 32.Half of 114 =
  33. 33.Half of 86 =
  34. 34.Half of 174 =
  35. 35.Half of 186 =
  36. 36.Half of 48 =
  37. 37.Double 37 =
  38. 38.Double 82 =
  39. 39.Double 94 =
  40. 40.Double 49 =

Answer key

  1. 194
  2. 136
  3. 84
  4. 186
  5. 68
  6. 36
  7. 176
  8. 110
  9. 50
  10. 67
  11. 20
  12. 118
  13. 66
  14. 86
  15. 35
  16. 198
  17. 34
  18. 28
  19. 95
  20. 70
  21. 56
  22. 64
  23. 158
  24. 52
  25. 156
  26. 54
  27. 82
  28. 108
  29. 152
  30. 172
  31. 56
  32. 57
  33. 43
  34. 87
  35. 93
  36. 24
  37. 74
  38. 164
  39. 188
  40. 98

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