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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 634 · 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 28 =
  2. 2.Double 68 =
  3. 3.Half of 162 =
  4. 4.Half of 138 =
  5. 5.Half of 96 =
  6. 6.Double 56 =
  7. 7.Half of 150 =
  8. 8.Half of 88 =
  9. 9.Half of 28 =
  10. 10.Double 53 =
  11. 11.Half of 62 =
  12. 12.Double 95 =
  13. 13.Double 57 =
  14. 14.Half of 100 =
  15. 15.Double 35 =
  16. 16.Double 99 =
  17. 17.Double 85 =
  18. 18.Double 51 =
  19. 19.Double 17 =
  20. 20.Double 21 =
  21. 21.Double 81 =
  22. 22.Double 74 =
  23. 23.Half of 36 =
  24. 24.Half of 192 =
  25. 25.Double 27 =
  26. 26.Half of 176 =
  27. 27.Double 63 =
  28. 28.Double 41 =
  29. 29.Half of 116 =
  30. 30.Double 24 =
  31. 31.Double 91 =
  32. 32.Half of 76 =
  33. 33.Double 45 =
  34. 34.Double 19 =
  35. 35.Double 92 =
  36. 36.Half of 186 =
  37. 37.Double 37 =
  38. 38.Double 84 =
  39. 39.Double 98 =
  40. 40.Half of 72 =

Answer key

  1. 56
  2. 136
  3. 81
  4. 69
  5. 48
  6. 112
  7. 75
  8. 44
  9. 14
  10. 106
  11. 31
  12. 190
  13. 114
  14. 50
  15. 70
  16. 198
  17. 170
  18. 102
  19. 34
  20. 42
  21. 162
  22. 148
  23. 18
  24. 96
  25. 54
  26. 88
  27. 126
  28. 82
  29. 58
  30. 48
  31. 182
  32. 38
  33. 90
  34. 38
  35. 184
  36. 93
  37. 74
  38. 168
  39. 196
  40. 36

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