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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 822 · 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 38 =
  2. 2.Double 87 =
  3. 3.Double 67 =
  4. 4.Double 86 =
  5. 5.Half of 168 =
  6. 6.Half of 152 =
  7. 7.Half of 86 =
  8. 8.Double 51 =
  9. 9.Half of 182 =
  10. 10.Half of 88 =
  11. 11.Double 92 =
  12. 12.Double 95 =
  13. 13.Double 25 =
  14. 14.Half of 48 =
  15. 15.Double 76 =
  16. 16.Half of 62 =
  17. 17.Half of 116 =
  18. 18.Double 75 =
  19. 19.Half of 98 =
  20. 20.Double 48 =
  21. 21.Double 91 =
  22. 22.Half of 174 =
  23. 23.Half of 46 =
  24. 24.Half of 66 =
  25. 25.Double 19 =
  26. 26.Double 61 =
  27. 27.Half of 194 =
  28. 28.Double 93 =
  29. 29.Half of 72 =
  30. 30.Half of 176 =
  31. 31.Double 99 =
  32. 32.Double 16 =
  33. 33.Double 58 =
  34. 34.Half of 40 =
  35. 35.Double 42 =
  36. 36.Double 43 =
  37. 37.Half of 58 =
  38. 38.Half of 78 =
  39. 39.Half of 124 =
  40. 40.Half of 64 =

Answer key

  1. 76
  2. 174
  3. 134
  4. 172
  5. 84
  6. 76
  7. 43
  8. 102
  9. 91
  10. 44
  11. 184
  12. 190
  13. 50
  14. 24
  15. 152
  16. 31
  17. 58
  18. 150
  19. 49
  20. 96
  21. 182
  22. 87
  23. 23
  24. 33
  25. 38
  26. 122
  27. 97
  28. 186
  29. 36
  30. 88
  31. 198
  32. 32
  33. 116
  34. 20
  35. 84
  36. 86
  37. 29
  38. 39
  39. 62
  40. 32

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