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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 361 · 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 116 =
  2. 2.Double 37 =
  3. 3.Double 67 =
  4. 4.Half of 192 =
  5. 5.Half of 56 =
  6. 6.Half of 82 =
  7. 7.Half of 68 =
  8. 8.Double 78 =
  9. 9.Double 92 =
  10. 10.Half of 70 =
  11. 11.Double 81 =
  12. 12.Half of 148 =
  13. 13.Half of 168 =
  14. 14.Double 91 =
  15. 15.Double 54 =
  16. 16.Half of 96 =
  17. 17.Half of 182 =
  18. 18.Double 88 =
  19. 19.Half of 122 =
  20. 20.Half of 44 =
  21. 21.Double 45 =
  22. 22.Half of 112 =
  23. 23.Double 41 =
  24. 24.Double 86 =
  25. 25.Double 36 =
  26. 26.Double 17 =
  27. 27.Half of 30 =
  28. 28.Half of 138 =
  29. 29.Half of 194 =
  30. 30.Half of 196 =
  31. 31.Double 33 =
  32. 32.Double 98 =
  33. 33.Double 58 =
  34. 34.Half of 100 =
  35. 35.Double 34 =
  36. 36.Half of 102 =
  37. 37.Half of 124 =
  38. 38.Half of 28 =
  39. 39.Double 77 =
  40. 40.Half of 136 =

Answer key

  1. 58
  2. 74
  3. 134
  4. 96
  5. 28
  6. 41
  7. 34
  8. 156
  9. 184
  10. 35
  11. 162
  12. 74
  13. 84
  14. 182
  15. 108
  16. 48
  17. 91
  18. 176
  19. 61
  20. 22
  21. 90
  22. 56
  23. 82
  24. 172
  25. 72
  26. 34
  27. 15
  28. 69
  29. 97
  30. 98
  31. 66
  32. 196
  33. 116
  34. 50
  35. 68
  36. 51
  37. 62
  38. 14
  39. 154
  40. 68

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