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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 273 · 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 26 =
  2. 2.Double 56 =
  3. 3.Half of 136 =
  4. 4.Half of 88 =
  5. 5.Half of 28 =
  6. 6.Double 36 =
  7. 7.Double 43 =
  8. 8.Half of 46 =
  9. 9.Half of 66 =
  10. 10.Double 37 =
  11. 11.Half of 92 =
  12. 12.Double 64 =
  13. 13.Double 96 =
  14. 14.Double 29 =
  15. 15.Half of 148 =
  16. 16.Half of 162 =
  17. 17.Double 22 =
  18. 18.Half of 164 =
  19. 19.Double 38 =
  20. 20.Double 82 =
  21. 21.Half of 74 =
  22. 22.Double 68 =
  23. 23.Double 69 =
  24. 24.Double 99 =
  25. 25.Half of 118 =
  26. 26.Double 76 =
  27. 27.Half of 100 =
  28. 28.Half of 86 =
  29. 29.Half of 98 =
  30. 30.Half of 170 =
  31. 31.Half of 146 =
  32. 32.Half of 26 =
  33. 33.Double 71 =
  34. 34.Half of 172 =
  35. 35.Double 62 =
  36. 36.Half of 82 =
  37. 37.Half of 176 =
  38. 38.Double 33 =
  39. 39.Half of 56 =
  40. 40.Half of 78 =

Answer key

  1. 52
  2. 112
  3. 68
  4. 44
  5. 14
  6. 72
  7. 86
  8. 23
  9. 33
  10. 74
  11. 46
  12. 128
  13. 192
  14. 58
  15. 74
  16. 81
  17. 44
  18. 82
  19. 76
  20. 164
  21. 37
  22. 136
  23. 138
  24. 198
  25. 59
  26. 152
  27. 50
  28. 43
  29. 49
  30. 85
  31. 73
  32. 13
  33. 142
  34. 86
  35. 124
  36. 41
  37. 88
  38. 66
  39. 28
  40. 39

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