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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 232 · 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 33 =
  2. 2.Double 31 =
  3. 3.Half of 44 =
  4. 4.Double 27 =
  5. 5.Double 81 =
  6. 6.Double 28 =
  7. 7.Half of 42 =
  8. 8.Double 47 =
  9. 9.Double 91 =
  10. 10.Double 76 =
  11. 11.Double 38 =
  12. 12.Half of 56 =
  13. 13.Double 21 =
  14. 14.Half of 132 =
  15. 15.Double 74 =
  16. 16.Half of 46 =
  17. 17.Double 45 =
  18. 18.Half of 134 =
  19. 19.Half of 158 =
  20. 20.Double 89 =
  21. 21.Double 54 =
  22. 22.Half of 184 =
  23. 23.Half of 162 =
  24. 24.Double 65 =
  25. 25.Double 99 =
  26. 26.Double 61 =
  27. 27.Half of 136 =
  28. 28.Double 43 =
  29. 29.Half of 194 =
  30. 30.Double 78 =
  31. 31.Double 93 =
  32. 32.Double 42 =
  33. 33.Half of 102 =
  34. 34.Double 51 =
  35. 35.Double 92 =
  36. 36.Double 59 =
  37. 37.Double 25 =
  38. 38.Half of 30 =
  39. 39.Half of 148 =
  40. 40.Half of 142 =

Answer key

  1. 66
  2. 62
  3. 22
  4. 54
  5. 162
  6. 56
  7. 21
  8. 94
  9. 182
  10. 152
  11. 76
  12. 28
  13. 42
  14. 66
  15. 148
  16. 23
  17. 90
  18. 67
  19. 79
  20. 178
  21. 108
  22. 92
  23. 81
  24. 130
  25. 198
  26. 122
  27. 68
  28. 86
  29. 97
  30. 156
  31. 186
  32. 84
  33. 51
  34. 102
  35. 184
  36. 118
  37. 50
  38. 15
  39. 74
  40. 71

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