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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 619 · 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 75 =
  2. 2.Double 29 =
  3. 3.Half of 36 =
  4. 4.Half of 182 =
  5. 5.Double 18 =
  6. 6.Double 48 =
  7. 7.Half of 136 =
  8. 8.Double 31 =
  9. 9.Double 94 =
  10. 10.Half of 102 =
  11. 11.Half of 70 =
  12. 12.Half of 174 =
  13. 13.Half of 106 =
  14. 14.Half of 30 =
  15. 15.Half of 80 =
  16. 16.Double 81 =
  17. 17.Half of 26 =
  18. 18.Double 76 =
  19. 19.Double 21 =
  20. 20.Half of 72 =
  21. 21.Half of 158 =
  22. 22.Half of 120 =
  23. 23.Double 41 =
  24. 24.Double 99 =
  25. 25.Double 34 =
  26. 26.Half of 168 =
  27. 27.Double 46 =
  28. 28.Double 35 =
  29. 29.Double 51 =
  30. 30.Half of 176 =
  31. 31.Half of 156 =
  32. 32.Double 17 =
  33. 33.Half of 128 =
  34. 34.Double 78 =
  35. 35.Double 79 =
  36. 36.Half of 184 =
  37. 37.Double 49 =
  38. 38.Double 55 =
  39. 39.Double 86 =
  40. 40.Double 63 =

Answer key

  1. 150
  2. 58
  3. 18
  4. 91
  5. 36
  6. 96
  7. 68
  8. 62
  9. 188
  10. 51
  11. 35
  12. 87
  13. 53
  14. 15
  15. 40
  16. 162
  17. 13
  18. 152
  19. 42
  20. 36
  21. 79
  22. 60
  23. 82
  24. 198
  25. 68
  26. 84
  27. 92
  28. 70
  29. 102
  30. 88
  31. 78
  32. 34
  33. 64
  34. 156
  35. 158
  36. 92
  37. 98
  38. 110
  39. 172
  40. 126

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