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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 290 · 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 88 =
  2. 2.Double 67 =
  3. 3.Double 52 =
  4. 4.Double 45 =
  5. 5.Half of 186 =
  6. 6.Half of 34 =
  7. 7.Half of 162 =
  8. 8.Double 27 =
  9. 9.Double 94 =
  10. 10.Half of 110 =
  11. 11.Double 84 =
  12. 12.Double 73 =
  13. 13.Double 66 =
  14. 14.Double 98 =
  15. 15.Double 35 =
  16. 16.Double 25 =
  17. 17.Half of 36 =
  18. 18.Double 71 =
  19. 19.Half of 58 =
  20. 20.Double 17 =
  21. 21.Half of 64 =
  22. 22.Double 69 =
  23. 23.Half of 42 =
  24. 24.Double 41 =
  25. 25.Double 31 =
  26. 26.Double 59 =
  27. 27.Double 55 =
  28. 28.Double 61 =
  29. 29.Half of 144 =
  30. 30.Half of 112 =
  31. 31.Half of 70 =
  32. 32.Half of 176 =
  33. 33.Double 91 =
  34. 34.Double 76 =
  35. 35.Double 96 =
  36. 36.Half of 146 =
  37. 37.Double 89 =
  38. 38.Double 39 =
  39. 39.Double 81 =
  40. 40.Half of 132 =

Answer key

  1. 176
  2. 134
  3. 104
  4. 90
  5. 93
  6. 17
  7. 81
  8. 54
  9. 188
  10. 55
  11. 168
  12. 146
  13. 132
  14. 196
  15. 70
  16. 50
  17. 18
  18. 142
  19. 29
  20. 34
  21. 32
  22. 138
  23. 21
  24. 82
  25. 62
  26. 118
  27. 110
  28. 122
  29. 72
  30. 56
  31. 35
  32. 88
  33. 182
  34. 152
  35. 192
  36. 73
  37. 178
  38. 78
  39. 162
  40. 66

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