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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 334 · 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 94 =
  2. 2.Half of 114 =
  3. 3.Half of 92 =
  4. 4.Double 28 =
  5. 5.Half of 198 =
  6. 6.Double 91 =
  7. 7.Half of 142 =
  8. 8.Double 51 =
  9. 9.Double 76 =
  10. 10.Half of 194 =
  11. 11.Double 23 =
  12. 12.Double 54 =
  13. 13.Half of 176 =
  14. 14.Double 19 =
  15. 15.Double 42 =
  16. 16.Half of 66 =
  17. 17.Half of 64 =
  18. 18.Double 71 =
  19. 19.Double 87 =
  20. 20.Half of 58 =
  21. 21.Double 62 =
  22. 22.Half of 186 =
  23. 23.Double 27 =
  24. 24.Double 75 =
  25. 25.Half of 134 =
  26. 26.Half of 78 =
  27. 27.Half of 180 =
  28. 28.Half of 48 =
  29. 29.Half of 196 =
  30. 30.Half of 190 =
  31. 31.Double 77 =
  32. 32.Double 21 =
  33. 33.Half of 152 =
  34. 34.Half of 168 =
  35. 35.Double 45 =
  36. 36.Half of 144 =
  37. 37.Double 81 =
  38. 38.Double 55 =
  39. 39.Double 67 =
  40. 40.Half of 118 =

Answer key

  1. 47
  2. 57
  3. 46
  4. 56
  5. 99
  6. 182
  7. 71
  8. 102
  9. 152
  10. 97
  11. 46
  12. 108
  13. 88
  14. 38
  15. 84
  16. 33
  17. 32
  18. 142
  19. 174
  20. 29
  21. 124
  22. 93
  23. 54
  24. 150
  25. 67
  26. 39
  27. 90
  28. 24
  29. 98
  30. 95
  31. 154
  32. 42
  33. 76
  34. 84
  35. 90
  36. 72
  37. 162
  38. 110
  39. 134
  40. 59

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