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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 502 · 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 69 =
  2. 2.Double 67 =
  3. 3.Half of 38 =
  4. 4.Double 92 =
  5. 5.Double 91 =
  6. 6.Half of 136 =
  7. 7.Half of 114 =
  8. 8.Double 86 =
  9. 9.Double 89 =
  10. 10.Half of 158 =
  11. 11.Double 96 =
  12. 12.Half of 92 =
  13. 13.Half of 50 =
  14. 14.Double 79 =
  15. 15.Double 75 =
  16. 16.Double 39 =
  17. 17.Half of 128 =
  18. 18.Double 17 =
  19. 19.Half of 44 =
  20. 20.Half of 144 =
  21. 21.Double 41 =
  22. 22.Half of 156 =
  23. 23.Double 35 =
  24. 24.Half of 192 =
  25. 25.Half of 126 =
  26. 26.Double 87 =
  27. 27.Half of 82 =
  28. 28.Half of 64 =
  29. 29.Double 54 =
  30. 30.Half of 186 =
  31. 31.Half of 176 =
  32. 32.Double 19 =
  33. 33.Double 21 =
  34. 34.Half of 154 =
  35. 35.Double 64 =
  36. 36.Half of 32 =
  37. 37.Double 66 =
  38. 38.Half of 142 =
  39. 39.Half of 160 =
  40. 40.Double 74 =

Answer key

  1. 138
  2. 134
  3. 19
  4. 184
  5. 182
  6. 68
  7. 57
  8. 172
  9. 178
  10. 79
  11. 192
  12. 46
  13. 25
  14. 158
  15. 150
  16. 78
  17. 64
  18. 34
  19. 22
  20. 72
  21. 82
  22. 78
  23. 70
  24. 96
  25. 63
  26. 174
  27. 41
  28. 32
  29. 108
  30. 93
  31. 88
  32. 38
  33. 42
  34. 77
  35. 128
  36. 16
  37. 132
  38. 71
  39. 80
  40. 148

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