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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 397 · 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 41 =
  2. 2.Double 91 =
  3. 3.Double 75 =
  4. 4.Half of 90 =
  5. 5.Double 71 =
  6. 6.Half of 192 =
  7. 7.Double 29 =
  8. 8.Half of 176 =
  9. 9.Half of 164 =
  10. 10.Double 35 =
  11. 11.Half of 190 =
  12. 12.Half of 96 =
  13. 13.Double 44 =
  14. 14.Double 47 =
  15. 15.Double 89 =
  16. 16.Half of 48 =
  17. 17.Half of 70 =
  18. 18.Half of 46 =
  19. 19.Double 81 =
  20. 20.Half of 86 =
  21. 21.Half of 170 =
  22. 22.Double 67 =
  23. 23.Half of 194 =
  24. 24.Double 52 =
  25. 25.Half of 166 =
  26. 26.Double 66 =
  27. 27.Half of 196 =
  28. 28.Half of 152 =
  29. 29.Half of 68 =
  30. 30.Double 34 =
  31. 31.Double 33 =
  32. 32.Double 96 =
  33. 33.Half of 30 =
  34. 34.Double 53 =
  35. 35.Double 24 =
  36. 36.Half of 94 =
  37. 37.Half of 144 =
  38. 38.Half of 64 =
  39. 39.Double 32 =
  40. 40.Double 22 =

Answer key

  1. 82
  2. 182
  3. 150
  4. 45
  5. 142
  6. 96
  7. 58
  8. 88
  9. 82
  10. 70
  11. 95
  12. 48
  13. 88
  14. 94
  15. 178
  16. 24
  17. 35
  18. 23
  19. 162
  20. 43
  21. 85
  22. 134
  23. 97
  24. 104
  25. 83
  26. 132
  27. 98
  28. 76
  29. 34
  30. 68
  31. 66
  32. 192
  33. 15
  34. 106
  35. 48
  36. 47
  37. 72
  38. 32
  39. 64
  40. 44

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