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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 723 · 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 190 =
  2. 2.Half of 170 =
  3. 3.Double 35 =
  4. 4.Double 63 =
  5. 5.Double 17 =
  6. 6.Half of 94 =
  7. 7.Double 49 =
  8. 8.Double 29 =
  9. 9.Double 57 =
  10. 10.Half of 196 =
  11. 11.Double 37 =
  12. 12.Double 32 =
  13. 13.Double 34 =
  14. 14.Double 79 =
  15. 15.Double 76 =
  16. 16.Half of 162 =
  17. 17.Half of 126 =
  18. 18.Half of 78 =
  19. 19.Double 61 =
  20. 20.Double 99 =
  21. 21.Half of 136 =
  22. 22.Half of 154 =
  23. 23.Double 67 =
  24. 24.Half of 46 =
  25. 25.Half of 192 =
  26. 26.Double 43 =
  27. 27.Double 27 =
  28. 28.Double 46 =
  29. 29.Double 72 =
  30. 30.Double 81 =
  31. 31.Half of 56 =
  32. 32.Half of 84 =
  33. 33.Double 74 =
  34. 34.Half of 80 =
  35. 35.Half of 172 =
  36. 36.Double 84 =
  37. 37.Half of 58 =
  38. 38.Half of 146 =
  39. 39.Double 31 =
  40. 40.Double 93 =

Answer key

  1. 95
  2. 85
  3. 70
  4. 126
  5. 34
  6. 47
  7. 98
  8. 58
  9. 114
  10. 98
  11. 74
  12. 64
  13. 68
  14. 158
  15. 152
  16. 81
  17. 63
  18. 39
  19. 122
  20. 198
  21. 68
  22. 77
  23. 134
  24. 23
  25. 96
  26. 86
  27. 54
  28. 92
  29. 144
  30. 162
  31. 28
  32. 42
  33. 148
  34. 40
  35. 86
  36. 168
  37. 29
  38. 73
  39. 62
  40. 186

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