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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 707 · 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 52 =
  2. 2.Double 19 =
  3. 3.Half of 46 =
  4. 4.Double 48 =
  5. 5.Half of 98 =
  6. 6.Double 85 =
  7. 7.Double 97 =
  8. 8.Double 56 =
  9. 9.Double 38 =
  10. 10.Half of 148 =
  11. 11.Half of 38 =
  12. 12.Double 46 =
  13. 13.Double 33 =
  14. 14.Half of 56 =
  15. 15.Half of 36 =
  16. 16.Half of 50 =
  17. 17.Double 64 =
  18. 18.Half of 180 =
  19. 19.Half of 82 =
  20. 20.Half of 120 =
  21. 21.Double 96 =
  22. 22.Half of 52 =
  23. 23.Half of 94 =
  24. 24.Half of 28 =
  25. 25.Half of 134 =
  26. 26.Half of 34 =
  27. 27.Double 66 =
  28. 28.Half of 192 =
  29. 29.Half of 190 =
  30. 30.Half of 160 =
  31. 31.Double 84 =
  32. 32.Half of 156 =
  33. 33.Half of 172 =
  34. 34.Half of 136 =
  35. 35.Double 21 =
  36. 36.Double 28 =
  37. 37.Half of 96 =
  38. 38.Half of 54 =
  39. 39.Double 79 =
  40. 40.Double 16 =

Answer key

  1. 104
  2. 38
  3. 23
  4. 96
  5. 49
  6. 170
  7. 194
  8. 112
  9. 76
  10. 74
  11. 19
  12. 92
  13. 66
  14. 28
  15. 18
  16. 25
  17. 128
  18. 90
  19. 41
  20. 60
  21. 192
  22. 26
  23. 47
  24. 14
  25. 67
  26. 17
  27. 132
  28. 96
  29. 95
  30. 80
  31. 168
  32. 78
  33. 86
  34. 68
  35. 42
  36. 56
  37. 48
  38. 27
  39. 158
  40. 32

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