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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 343 · 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 96 =
  2. 2.Half of 196 =
  3. 3.Half of 60 =
  4. 4.Half of 86 =
  5. 5.Double 28 =
  6. 6.Half of 58 =
  7. 7.Double 32 =
  8. 8.Double 16 =
  9. 9.Half of 192 =
  10. 10.Double 77 =
  11. 11.Double 98 =
  12. 12.Half of 186 =
  13. 13.Half of 92 =
  14. 14.Half of 138 =
  15. 15.Double 62 =
  16. 16.Half of 52 =
  17. 17.Half of 70 =
  18. 18.Half of 166 =
  19. 19.Double 44 =
  20. 20.Double 69 =
  21. 21.Half of 174 =
  22. 22.Double 24 =
  23. 23.Double 52 =
  24. 24.Half of 98 =
  25. 25.Half of 102 =
  26. 26.Half of 44 =
  27. 27.Half of 112 =
  28. 28.Double 22 =
  29. 29.Double 89 =
  30. 30.Half of 94 =
  31. 31.Half of 38 =
  32. 32.Double 59 =
  33. 33.Double 61 =
  34. 34.Double 49 =
  35. 35.Double 41 =
  36. 36.Half of 36 =
  37. 37.Double 55 =
  38. 38.Double 94 =
  39. 39.Double 36 =
  40. 40.Half of 142 =

Answer key

  1. 192
  2. 98
  3. 30
  4. 43
  5. 56
  6. 29
  7. 64
  8. 32
  9. 96
  10. 154
  11. 196
  12. 93
  13. 46
  14. 69
  15. 124
  16. 26
  17. 35
  18. 83
  19. 88
  20. 138
  21. 87
  22. 48
  23. 104
  24. 49
  25. 51
  26. 22
  27. 56
  28. 44
  29. 178
  30. 47
  31. 19
  32. 118
  33. 122
  34. 98
  35. 82
  36. 18
  37. 110
  38. 188
  39. 72
  40. 71

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