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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 540 · 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 76 =
  2. 2.Half of 164 =
  3. 3.Double 32 =
  4. 4.Double 25 =
  5. 5.Double 37 =
  6. 6.Half of 58 =
  7. 7.Half of 48 =
  8. 8.Double 17 =
  9. 9.Double 99 =
  10. 10.Half of 98 =
  11. 11.Half of 180 =
  12. 12.Double 98 =
  13. 13.Double 74 =
  14. 14.Double 82 =
  15. 15.Double 38 =
  16. 16.Double 83 =
  17. 17.Half of 116 =
  18. 18.Double 31 =
  19. 19.Half of 162 =
  20. 20.Double 58 =
  21. 21.Double 97 =
  22. 22.Half of 44 =
  23. 23.Double 48 =
  24. 24.Double 91 =
  25. 25.Half of 122 =
  26. 26.Half of 64 =
  27. 27.Double 72 =
  28. 28.Half of 52 =
  29. 29.Half of 54 =
  30. 30.Double 33 =
  31. 31.Double 68 =
  32. 32.Half of 56 =
  33. 33.Double 65 =
  34. 34.Double 41 =
  35. 35.Double 43 =
  36. 36.Half of 66 =
  37. 37.Double 54 =
  38. 38.Double 16 =
  39. 39.Double 81 =
  40. 40.Double 86 =

Answer key

  1. 152
  2. 82
  3. 64
  4. 50
  5. 74
  6. 29
  7. 24
  8. 34
  9. 198
  10. 49
  11. 90
  12. 196
  13. 148
  14. 164
  15. 76
  16. 166
  17. 58
  18. 62
  19. 81
  20. 116
  21. 194
  22. 22
  23. 96
  24. 182
  25. 61
  26. 32
  27. 144
  28. 26
  29. 27
  30. 66
  31. 136
  32. 28
  33. 130
  34. 82
  35. 86
  36. 33
  37. 108
  38. 32
  39. 162
  40. 172

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