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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 279 · 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 31 =
  2. 2.Double 24 =
  3. 3.Double 78 =
  4. 4.Double 41 =
  5. 5.Half of 166 =
  6. 6.Half of 132 =
  7. 7.Double 81 =
  8. 8.Half of 190 =
  9. 9.Half of 48 =
  10. 10.Double 56 =
  11. 11.Half of 102 =
  12. 12.Double 63 =
  13. 13.Double 89 =
  14. 14.Half of 44 =
  15. 15.Double 58 =
  16. 16.Half of 196 =
  17. 17.Double 22 =
  18. 18.Half of 172 =
  19. 19.Half of 188 =
  20. 20.Half of 58 =
  21. 21.Half of 32 =
  22. 22.Half of 134 =
  23. 23.Half of 62 =
  24. 24.Double 71 =
  25. 25.Half of 184 =
  26. 26.Half of 128 =
  27. 27.Double 21 =
  28. 28.Half of 42 =
  29. 29.Half of 194 =
  30. 30.Half of 106 =
  31. 31.Double 86 =
  32. 32.Double 98 =
  33. 33.Half of 26 =
  34. 34.Half of 52 =
  35. 35.Half of 34 =
  36. 36.Half of 174 =
  37. 37.Double 33 =
  38. 38.Double 77 =
  39. 39.Half of 180 =
  40. 40.Double 51 =

Answer key

  1. 62
  2. 48
  3. 156
  4. 82
  5. 83
  6. 66
  7. 162
  8. 95
  9. 24
  10. 112
  11. 51
  12. 126
  13. 178
  14. 22
  15. 116
  16. 98
  17. 44
  18. 86
  19. 94
  20. 29
  21. 16
  22. 67
  23. 31
  24. 142
  25. 92
  26. 64
  27. 42
  28. 21
  29. 97
  30. 53
  31. 172
  32. 196
  33. 13
  34. 26
  35. 17
  36. 87
  37. 66
  38. 154
  39. 90
  40. 102

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