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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 197 · 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 62 =
  2. 2.Half of 38 =
  3. 3.Double 74 =
  4. 4.Double 98 =
  5. 5.Double 38 =
  6. 6.Half of 156 =
  7. 7.Double 49 =
  8. 8.Half of 184 =
  9. 9.Half of 176 =
  10. 10.Double 33 =
  11. 11.Double 82 =
  12. 12.Half of 196 =
  13. 13.Double 31 =
  14. 14.Half of 166 =
  15. 15.Double 89 =
  16. 16.Double 91 =
  17. 17.Double 87 =
  18. 18.Half of 164 =
  19. 19.Double 72 =
  20. 20.Double 26 =
  21. 21.Half of 106 =
  22. 22.Half of 136 =
  23. 23.Half of 76 =
  24. 24.Double 44 =
  25. 25.Half of 68 =
  26. 26.Double 88 =
  27. 27.Half of 58 =
  28. 28.Double 53 =
  29. 29.Double 71 =
  30. 30.Half of 42 =
  31. 31.Half of 190 =
  32. 32.Half of 110 =
  33. 33.Half of 54 =
  34. 34.Half of 70 =
  35. 35.Half of 62 =
  36. 36.Double 51 =
  37. 37.Half of 112 =
  38. 38.Double 22 =
  39. 39.Double 65 =
  40. 40.Double 21 =

Answer key

  1. 124
  2. 19
  3. 148
  4. 196
  5. 76
  6. 78
  7. 98
  8. 92
  9. 88
  10. 66
  11. 164
  12. 98
  13. 62
  14. 83
  15. 178
  16. 182
  17. 174
  18. 82
  19. 144
  20. 52
  21. 53
  22. 68
  23. 38
  24. 88
  25. 34
  26. 176
  27. 29
  28. 106
  29. 142
  30. 21
  31. 95
  32. 55
  33. 27
  34. 35
  35. 31
  36. 102
  37. 56
  38. 44
  39. 130
  40. 42

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