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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 500 · 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 71 =
  2. 2.Half of 30 =
  3. 3.Half of 100 =
  4. 4.Double 46 =
  5. 5.Half of 196 =
  6. 6.Double 52 =
  7. 7.Double 55 =
  8. 8.Double 83 =
  9. 9.Half of 188 =
  10. 10.Double 29 =
  11. 11.Double 51 =
  12. 12.Half of 172 =
  13. 13.Double 28 =
  14. 14.Double 43 =
  15. 15.Double 41 =
  16. 16.Double 99 =
  17. 17.Double 92 =
  18. 18.Half of 54 =
  19. 19.Half of 166 =
  20. 20.Half of 48 =
  21. 21.Double 44 =
  22. 22.Half of 198 =
  23. 23.Double 82 =
  24. 24.Half of 88 =
  25. 25.Half of 64 =
  26. 26.Double 97 =
  27. 27.Double 21 =
  28. 28.Double 19 =
  29. 29.Half of 142 =
  30. 30.Double 79 =
  31. 31.Half of 102 =
  32. 32.Half of 184 =
  33. 33.Double 72 =
  34. 34.Double 68 =
  35. 35.Double 48 =
  36. 36.Double 27 =
  37. 37.Double 18 =
  38. 38.Double 33 =
  39. 39.Double 67 =
  40. 40.Half of 178 =

Answer key

  1. 142
  2. 15
  3. 50
  4. 92
  5. 98
  6. 104
  7. 110
  8. 166
  9. 94
  10. 58
  11. 102
  12. 86
  13. 56
  14. 86
  15. 82
  16. 198
  17. 184
  18. 27
  19. 83
  20. 24
  21. 88
  22. 99
  23. 164
  24. 44
  25. 32
  26. 194
  27. 42
  28. 38
  29. 71
  30. 158
  31. 51
  32. 92
  33. 144
  34. 136
  35. 96
  36. 54
  37. 36
  38. 66
  39. 134
  40. 89

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