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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 1 · 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.Half of 52 =
  2. 2.Double 91 =
  3. 3.Double 28 =
  4. 4.Double 99 =
  5. 5.Double 42 =
  6. 6.Half of 144 =
  7. 7.Half of 90 =
  8. 8.Double 18 =
  9. 9.Double 53 =
  10. 10.Half of 54 =
  11. 11.Double 71 =
  12. 12.Half of 166 =
  13. 13.Half of 162 =
  14. 14.Half of 128 =
  15. 15.Half of 152 =
  16. 16.Double 98 =
  17. 17.Half of 88 =
  18. 18.Double 49 =
  19. 19.Half of 176 =
  20. 20.Half of 72 =
  21. 21.Half of 192 =
  22. 22.Double 32 =
  23. 23.Double 38 =
  24. 24.Half of 150 =
  25. 25.Double 84 =
  26. 26.Half of 140 =
  27. 27.Half of 148 =
  28. 28.Half of 80 =
  29. 29.Double 86 =
  30. 30.Double 29 =
  31. 31.Half of 64 =
  32. 32.Double 47 =
  33. 33.Double 76 =
  34. 34.Half of 48 =
  35. 35.Half of 28 =
  36. 36.Double 51 =
  37. 37.Half of 168 =
  38. 38.Double 37 =
  39. 39.Half of 120 =
  40. 40.Double 35 =

Answer key

  1. 26
  2. 182
  3. 56
  4. 198
  5. 84
  6. 72
  7. 45
  8. 36
  9. 106
  10. 27
  11. 142
  12. 83
  13. 81
  14. 64
  15. 76
  16. 196
  17. 44
  18. 98
  19. 88
  20. 36
  21. 96
  22. 64
  23. 76
  24. 75
  25. 168
  26. 70
  27. 74
  28. 40
  29. 172
  30. 58
  31. 32
  32. 94
  33. 152
  34. 24
  35. 14
  36. 102
  37. 84
  38. 74
  39. 60
  40. 70

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