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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 746 · 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 87 =
  2. 2.Half of 196 =
  3. 3.Half of 32 =
  4. 4.Half of 194 =
  5. 5.Half of 62 =
  6. 6.Half of 26 =
  7. 7.Double 79 =
  8. 8.Double 41 =
  9. 9.Double 86 =
  10. 10.Half of 66 =
  11. 11.Double 21 =
  12. 12.Double 88 =
  13. 13.Double 24 =
  14. 14.Double 77 =
  15. 15.Double 92 =
  16. 16.Half of 76 =
  17. 17.Half of 90 =
  18. 18.Double 55 =
  19. 19.Half of 182 =
  20. 20.Half of 198 =
  21. 21.Half of 132 =
  22. 22.Half of 126 =
  23. 23.Double 81 =
  24. 24.Half of 88 =
  25. 25.Half of 172 =
  26. 26.Half of 188 =
  27. 27.Double 68 =
  28. 28.Double 91 =
  29. 29.Half of 186 =
  30. 30.Half of 180 =
  31. 31.Half of 124 =
  32. 32.Double 42 =
  33. 33.Double 23 =
  34. 34.Double 56 =
  35. 35.Double 97 =
  36. 36.Half of 72 =
  37. 37.Half of 46 =
  38. 38.Half of 52 =
  39. 39.Half of 144 =
  40. 40.Double 69 =

Answer key

  1. 174
  2. 98
  3. 16
  4. 97
  5. 31
  6. 13
  7. 158
  8. 82
  9. 172
  10. 33
  11. 42
  12. 176
  13. 48
  14. 154
  15. 184
  16. 38
  17. 45
  18. 110
  19. 91
  20. 99
  21. 66
  22. 63
  23. 162
  24. 44
  25. 86
  26. 94
  27. 136
  28. 182
  29. 93
  30. 90
  31. 62
  32. 84
  33. 46
  34. 112
  35. 194
  36. 36
  37. 23
  38. 26
  39. 72
  40. 138

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