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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 328 · 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 61 =
  2. 2.Double 91 =
  3. 3.Double 22 =
  4. 4.Double 64 =
  5. 5.Double 85 =
  6. 6.Half of 94 =
  7. 7.Half of 198 =
  8. 8.Double 84 =
  9. 9.Double 79 =
  10. 10.Half of 184 =
  11. 11.Double 76 =
  12. 12.Double 44 =
  13. 13.Half of 42 =
  14. 14.Double 33 =
  15. 15.Double 99 =
  16. 16.Half of 144 =
  17. 17.Half of 162 =
  18. 18.Half of 56 =
  19. 19.Double 51 =
  20. 20.Double 92 =
  21. 21.Double 45 =
  22. 22.Double 34 =
  23. 23.Half of 78 =
  24. 24.Half of 122 =
  25. 25.Double 73 =
  26. 26.Double 32 =
  27. 27.Half of 26 =
  28. 28.Double 46 =
  29. 29.Double 74 =
  30. 30.Half of 90 =
  31. 31.Half of 102 =
  32. 32.Half of 70 =
  33. 33.Half of 170 =
  34. 34.Double 71 =
  35. 35.Double 62 =
  36. 36.Half of 136 =
  37. 37.Half of 44 =
  38. 38.Half of 84 =
  39. 39.Double 93 =
  40. 40.Double 42 =

Answer key

  1. 122
  2. 182
  3. 44
  4. 128
  5. 170
  6. 47
  7. 99
  8. 168
  9. 158
  10. 92
  11. 152
  12. 88
  13. 21
  14. 66
  15. 198
  16. 72
  17. 81
  18. 28
  19. 102
  20. 184
  21. 90
  22. 68
  23. 39
  24. 61
  25. 146
  26. 64
  27. 13
  28. 92
  29. 148
  30. 45
  31. 51
  32. 35
  33. 85
  34. 142
  35. 124
  36. 68
  37. 22
  38. 42
  39. 186
  40. 84

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