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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 803 · 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 102 =
  2. 2.Double 68 =
  3. 3.Double 94 =
  4. 4.Half of 180 =
  5. 5.Half of 178 =
  6. 6.Double 26 =
  7. 7.Double 86 =
  8. 8.Double 91 =
  9. 9.Half of 74 =
  10. 10.Half of 58 =
  11. 11.Double 57 =
  12. 12.Double 87 =
  13. 13.Double 29 =
  14. 14.Double 79 =
  15. 15.Half of 132 =
  16. 16.Double 23 =
  17. 17.Half of 122 =
  18. 18.Double 64 =
  19. 19.Half of 80 =
  20. 20.Double 49 =
  21. 21.Half of 164 =
  22. 22.Double 92 =
  23. 23.Double 83 =
  24. 24.Half of 190 =
  25. 25.Half of 176 =
  26. 26.Double 76 =
  27. 27.Half of 114 =
  28. 28.Half of 52 =
  29. 29.Double 33 =
  30. 30.Half of 50 =
  31. 31.Double 42 =
  32. 32.Half of 92 =
  33. 33.Half of 90 =
  34. 34.Double 39 =
  35. 35.Half of 188 =
  36. 36.Half of 128 =
  37. 37.Half of 124 =
  38. 38.Double 54 =
  39. 39.Half of 62 =
  40. 40.Double 84 =

Answer key

  1. 51
  2. 136
  3. 188
  4. 90
  5. 89
  6. 52
  7. 172
  8. 182
  9. 37
  10. 29
  11. 114
  12. 174
  13. 58
  14. 158
  15. 66
  16. 46
  17. 61
  18. 128
  19. 40
  20. 98
  21. 82
  22. 184
  23. 166
  24. 95
  25. 88
  26. 152
  27. 57
  28. 26
  29. 66
  30. 25
  31. 84
  32. 46
  33. 45
  34. 78
  35. 94
  36. 64
  37. 62
  38. 108
  39. 31
  40. 168

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