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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 34 · 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 86 =
  2. 2.Double 84 =
  3. 3.Double 87 =
  4. 4.Double 39 =
  5. 5.Double 81 =
  6. 6.Double 99 =
  7. 7.Double 59 =
  8. 8.Double 28 =
  9. 9.Half of 52 =
  10. 10.Double 21 =
  11. 11.Double 67 =
  12. 12.Double 73 =
  13. 13.Half of 180 =
  14. 14.Double 19 =
  15. 15.Half of 54 =
  16. 16.Double 24 =
  17. 17.Half of 132 =
  18. 18.Double 35 =
  19. 19.Half of 60 =
  20. 20.Double 88 =
  21. 21.Double 34 =
  22. 22.Double 77 =
  23. 23.Half of 116 =
  24. 24.Double 38 =
  25. 25.Double 79 =
  26. 26.Half of 46 =
  27. 27.Half of 192 =
  28. 28.Half of 196 =
  29. 29.Half of 38 =
  30. 30.Half of 76 =
  31. 31.Double 78 =
  32. 32.Half of 40 =
  33. 33.Double 64 =
  34. 34.Half of 84 =
  35. 35.Half of 110 =
  36. 36.Half of 150 =
  37. 37.Double 85 =
  38. 38.Double 43 =
  39. 39.Half of 50 =
  40. 40.Double 46 =

Answer key

  1. 172
  2. 168
  3. 174
  4. 78
  5. 162
  6. 198
  7. 118
  8. 56
  9. 26
  10. 42
  11. 134
  12. 146
  13. 90
  14. 38
  15. 27
  16. 48
  17. 66
  18. 70
  19. 30
  20. 176
  21. 68
  22. 154
  23. 58
  24. 76
  25. 158
  26. 23
  27. 96
  28. 98
  29. 19
  30. 38
  31. 156
  32. 20
  33. 128
  34. 42
  35. 55
  36. 75
  37. 170
  38. 86
  39. 25
  40. 92

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