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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 428 · 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 124 =
  2. 2.Half of 176 =
  3. 3.Double 31 =
  4. 4.Double 17 =
  5. 5.Double 73 =
  6. 6.Double 94 =
  7. 7.Double 91 =
  8. 8.Half of 48 =
  9. 9.Double 34 =
  10. 10.Double 16 =
  11. 11.Half of 180 =
  12. 12.Half of 164 =
  13. 13.Double 27 =
  14. 14.Double 92 =
  15. 15.Half of 168 =
  16. 16.Half of 60 =
  17. 17.Half of 188 =
  18. 18.Half of 170 =
  19. 19.Double 55 =
  20. 20.Double 78 =
  21. 21.Half of 146 =
  22. 22.Double 74 =
  23. 23.Double 41 =
  24. 24.Half of 120 =
  25. 25.Double 24 =
  26. 26.Half of 64 =
  27. 27.Half of 172 =
  28. 28.Double 18 =
  29. 29.Half of 184 =
  30. 30.Double 99 =
  31. 31.Double 81 =
  32. 32.Double 61 =
  33. 33.Double 84 =
  34. 34.Half of 88 =
  35. 35.Double 21 =
  36. 36.Half of 30 =
  37. 37.Half of 34 =
  38. 38.Half of 196 =
  39. 39.Half of 74 =
  40. 40.Half of 66 =

Answer key

  1. 62
  2. 88
  3. 62
  4. 34
  5. 146
  6. 188
  7. 182
  8. 24
  9. 68
  10. 32
  11. 90
  12. 82
  13. 54
  14. 184
  15. 84
  16. 30
  17. 94
  18. 85
  19. 110
  20. 156
  21. 73
  22. 148
  23. 82
  24. 60
  25. 48
  26. 32
  27. 86
  28. 36
  29. 92
  30. 198
  31. 162
  32. 122
  33. 168
  34. 44
  35. 42
  36. 15
  37. 17
  38. 98
  39. 37
  40. 33

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