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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 149 · 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 186 =
  2. 2.Half of 172 =
  3. 3.Double 46 =
  4. 4.Half of 126 =
  5. 5.Double 21 =
  6. 6.Half of 84 =
  7. 7.Double 28 =
  8. 8.Double 55 =
  9. 9.Double 36 =
  10. 10.Double 95 =
  11. 11.Half of 26 =
  12. 12.Half of 146 =
  13. 13.Half of 66 =
  14. 14.Double 99 =
  15. 15.Double 53 =
  16. 16.Half of 150 =
  17. 17.Half of 50 =
  18. 18.Double 39 =
  19. 19.Double 23 =
  20. 20.Half of 94 =
  21. 21.Double 91 =
  22. 22.Double 42 =
  23. 23.Half of 44 =
  24. 24.Double 16 =
  25. 25.Double 98 =
  26. 26.Double 35 =
  27. 27.Half of 142 =
  28. 28.Double 65 =
  29. 29.Half of 88 =
  30. 30.Half of 54 =
  31. 31.Double 41 =
  32. 32.Half of 96 =
  33. 33.Half of 104 =
  34. 34.Double 78 =
  35. 35.Half of 72 =
  36. 36.Half of 80 =
  37. 37.Half of 158 =
  38. 38.Half of 28 =
  39. 39.Half of 64 =
  40. 40.Double 82 =

Answer key

  1. 93
  2. 86
  3. 92
  4. 63
  5. 42
  6. 42
  7. 56
  8. 110
  9. 72
  10. 190
  11. 13
  12. 73
  13. 33
  14. 198
  15. 106
  16. 75
  17. 25
  18. 78
  19. 46
  20. 47
  21. 182
  22. 84
  23. 22
  24. 32
  25. 196
  26. 70
  27. 71
  28. 130
  29. 44
  30. 27
  31. 82
  32. 48
  33. 52
  34. 156
  35. 36
  36. 40
  37. 79
  38. 14
  39. 32
  40. 164

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