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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 716 · 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 160 =
  2. 2.Double 76 =
  3. 3.Half of 42 =
  4. 4.Double 62 =
  5. 5.Double 41 =
  6. 6.Half of 134 =
  7. 7.Half of 192 =
  8. 8.Double 44 =
  9. 9.Double 78 =
  10. 10.Half of 56 =
  11. 11.Half of 46 =
  12. 12.Double 99 =
  13. 13.Double 24 =
  14. 14.Half of 84 =
  15. 15.Double 57 =
  16. 16.Half of 62 =
  17. 17.Double 27 =
  18. 18.Half of 28 =
  19. 19.Half of 194 =
  20. 20.Half of 188 =
  21. 21.Half of 180 =
  22. 22.Double 92 =
  23. 23.Double 28 =
  24. 24.Double 72 =
  25. 25.Double 29 =
  26. 26.Double 35 =
  27. 27.Half of 108 =
  28. 28.Double 94 =
  29. 29.Half of 80 =
  30. 30.Half of 38 =
  31. 31.Half of 118 =
  32. 32.Half of 156 =
  33. 33.Half of 86 =
  34. 34.Half of 40 =
  35. 35.Double 16 =
  36. 36.Double 21 =
  37. 37.Double 49 =
  38. 38.Half of 88 =
  39. 39.Half of 114 =
  40. 40.Half of 76 =

Answer key

  1. 80
  2. 152
  3. 21
  4. 124
  5. 82
  6. 67
  7. 96
  8. 88
  9. 156
  10. 28
  11. 23
  12. 198
  13. 48
  14. 42
  15. 114
  16. 31
  17. 54
  18. 14
  19. 97
  20. 94
  21. 90
  22. 184
  23. 56
  24. 144
  25. 58
  26. 70
  27. 54
  28. 188
  29. 40
  30. 19
  31. 59
  32. 78
  33. 43
  34. 20
  35. 32
  36. 42
  37. 98
  38. 44
  39. 57
  40. 38

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