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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 268 · 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 40 =
  2. 2.Half of 38 =
  3. 3.Half of 76 =
  4. 4.Double 29 =
  5. 5.Double 89 =
  6. 6.Double 98 =
  7. 7.Double 34 =
  8. 8.Half of 148 =
  9. 9.Double 39 =
  10. 10.Double 77 =
  11. 11.Half of 162 =
  12. 12.Double 38 =
  13. 13.Double 48 =
  14. 14.Half of 66 =
  15. 15.Double 58 =
  16. 16.Half of 144 =
  17. 17.Half of 26 =
  18. 18.Half of 122 =
  19. 19.Half of 118 =
  20. 20.Half of 92 =
  21. 21.Half of 44 =
  22. 22.Double 93 =
  23. 23.Double 96 =
  24. 24.Double 16 =
  25. 25.Double 41 =
  26. 26.Double 54 =
  27. 27.Double 79 =
  28. 28.Half of 90 =
  29. 29.Half of 80 =
  30. 30.Double 25 =
  31. 31.Double 95 =
  32. 32.Double 36 =
  33. 33.Double 84 =
  34. 34.Half of 102 =
  35. 35.Half of 124 =
  36. 36.Double 85 =
  37. 37.Half of 136 =
  38. 38.Half of 128 =
  39. 39.Double 22 =
  40. 40.Double 81 =

Answer key

  1. 20
  2. 19
  3. 38
  4. 58
  5. 178
  6. 196
  7. 68
  8. 74
  9. 78
  10. 154
  11. 81
  12. 76
  13. 96
  14. 33
  15. 116
  16. 72
  17. 13
  18. 61
  19. 59
  20. 46
  21. 22
  22. 186
  23. 192
  24. 32
  25. 82
  26. 108
  27. 158
  28. 45
  29. 40
  30. 50
  31. 190
  32. 72
  33. 168
  34. 51
  35. 62
  36. 170
  37. 68
  38. 64
  39. 44
  40. 162

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