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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 388 · 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 128 =
  2. 2.Half of 154 =
  3. 3.Half of 184 =
  4. 4.Double 78 =
  5. 5.Double 97 =
  6. 6.Double 95 =
  7. 7.Double 53 =
  8. 8.Half of 136 =
  9. 9.Double 32 =
  10. 10.Double 41 =
  11. 11.Double 91 =
  12. 12.Double 22 =
  13. 13.Half of 126 =
  14. 14.Half of 42 =
  15. 15.Half of 182 =
  16. 16.Half of 174 =
  17. 17.Double 84 =
  18. 18.Double 82 =
  19. 19.Half of 36 =
  20. 20.Half of 82 =
  21. 21.Double 27 =
  22. 22.Half of 32 =
  23. 23.Half of 52 =
  24. 24.Double 18 =
  25. 25.Double 92 =
  26. 26.Half of 84 =
  27. 27.Half of 112 =
  28. 28.Half of 88 =
  29. 29.Double 23 =
  30. 30.Double 34 =
  31. 31.Double 65 =
  32. 32.Half of 196 =
  33. 33.Double 74 =
  34. 34.Double 63 =
  35. 35.Half of 164 =
  36. 36.Double 67 =
  37. 37.Double 51 =
  38. 38.Double 31 =
  39. 39.Half of 38 =
  40. 40.Double 98 =

Answer key

  1. 64
  2. 77
  3. 92
  4. 156
  5. 194
  6. 190
  7. 106
  8. 68
  9. 64
  10. 82
  11. 182
  12. 44
  13. 63
  14. 21
  15. 91
  16. 87
  17. 168
  18. 164
  19. 18
  20. 41
  21. 54
  22. 16
  23. 26
  24. 36
  25. 184
  26. 42
  27. 56
  28. 44
  29. 46
  30. 68
  31. 130
  32. 98
  33. 148
  34. 126
  35. 82
  36. 134
  37. 102
  38. 62
  39. 19
  40. 196

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