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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 162 · 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 99 =
  2. 2.Double 46 =
  3. 3.Double 49 =
  4. 4.Double 87 =
  5. 5.Double 96 =
  6. 6.Half of 38 =
  7. 7.Half of 104 =
  8. 8.Half of 194 =
  9. 9.Half of 188 =
  10. 10.Double 81 =
  11. 11.Half of 74 =
  12. 12.Double 23 =
  13. 13.Double 24 =
  14. 14.Double 78 =
  15. 15.Half of 178 =
  16. 16.Half of 140 =
  17. 17.Half of 172 =
  18. 18.Double 61 =
  19. 19.Half of 70 =
  20. 20.Half of 100 =
  21. 21.Double 36 =
  22. 22.Double 21 =
  23. 23.Half of 160 =
  24. 24.Half of 94 =
  25. 25.Half of 88 =
  26. 26.Double 47 =
  27. 27.Half of 138 =
  28. 28.Double 95 =
  29. 29.Half of 142 =
  30. 30.Double 82 =
  31. 31.Half of 50 =
  32. 32.Double 17 =
  33. 33.Half of 78 =
  34. 34.Double 88 =
  35. 35.Double 52 =
  36. 36.Half of 112 =
  37. 37.Double 91 =
  38. 38.Half of 98 =
  39. 39.Double 29 =
  40. 40.Double 33 =

Answer key

  1. 198
  2. 92
  3. 98
  4. 174
  5. 192
  6. 19
  7. 52
  8. 97
  9. 94
  10. 162
  11. 37
  12. 46
  13. 48
  14. 156
  15. 89
  16. 70
  17. 86
  18. 122
  19. 35
  20. 50
  21. 72
  22. 42
  23. 80
  24. 47
  25. 44
  26. 94
  27. 69
  28. 190
  29. 71
  30. 164
  31. 25
  32. 34
  33. 39
  34. 176
  35. 104
  36. 56
  37. 182
  38. 49
  39. 58
  40. 66

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