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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 263 · 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 81 =
  2. 2.Double 68 =
  3. 3.Half of 152 =
  4. 4.Double 45 =
  5. 5.Double 41 =
  6. 6.Double 85 =
  7. 7.Half of 110 =
  8. 8.Double 39 =
  9. 9.Double 71 =
  10. 10.Half of 70 =
  11. 11.Half of 102 =
  12. 12.Double 36 =
  13. 13.Double 67 =
  14. 14.Half of 172 =
  15. 15.Double 23 =
  16. 16.Double 78 =
  17. 17.Double 96 =
  18. 18.Double 87 =
  19. 19.Half of 154 =
  20. 20.Half of 120 =
  21. 21.Double 88 =
  22. 22.Double 92 =
  23. 23.Half of 82 =
  24. 24.Double 44 =
  25. 25.Half of 182 =
  26. 26.Half of 56 =
  27. 27.Double 63 =
  28. 28.Double 83 =
  29. 29.Half of 28 =
  30. 30.Double 91 =
  31. 31.Half of 80 =
  32. 32.Half of 52 =
  33. 33.Half of 174 =
  34. 34.Double 21 =
  35. 35.Double 47 =
  36. 36.Double 55 =
  37. 37.Double 27 =
  38. 38.Double 69 =
  39. 39.Double 48 =
  40. 40.Half of 64 =

Answer key

  1. 162
  2. 136
  3. 76
  4. 90
  5. 82
  6. 170
  7. 55
  8. 78
  9. 142
  10. 35
  11. 51
  12. 72
  13. 134
  14. 86
  15. 46
  16. 156
  17. 192
  18. 174
  19. 77
  20. 60
  21. 176
  22. 184
  23. 41
  24. 88
  25. 91
  26. 28
  27. 126
  28. 166
  29. 14
  30. 182
  31. 40
  32. 26
  33. 87
  34. 42
  35. 94
  36. 110
  37. 54
  38. 138
  39. 96
  40. 32

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