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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 810 · 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 89 =
  2. 2.Double 79 =
  3. 3.Double 91 =
  4. 4.Half of 148 =
  5. 5.Double 74 =
  6. 6.Double 16 =
  7. 7.Half of 56 =
  8. 8.Double 51 =
  9. 9.Double 22 =
  10. 10.Double 43 =
  11. 11.Double 47 =
  12. 12.Half of 60 =
  13. 13.Double 36 =
  14. 14.Half of 146 =
  15. 15.Double 23 =
  16. 16.Half of 186 =
  17. 17.Half of 92 =
  18. 18.Half of 176 =
  19. 19.Double 58 =
  20. 20.Half of 152 =
  21. 21.Double 49 =
  22. 22.Half of 30 =
  23. 23.Half of 114 =
  24. 24.Double 19 =
  25. 25.Double 97 =
  26. 26.Half of 132 =
  27. 27.Double 81 =
  28. 28.Double 42 =
  29. 29.Half of 80 =
  30. 30.Double 28 =
  31. 31.Half of 42 =
  32. 32.Half of 68 =
  33. 33.Half of 96 =
  34. 34.Half of 178 =
  35. 35.Double 41 =
  36. 36.Half of 134 =
  37. 37.Double 39 =
  38. 38.Double 85 =
  39. 39.Half of 38 =
  40. 40.Double 62 =

Answer key

  1. 178
  2. 158
  3. 182
  4. 74
  5. 148
  6. 32
  7. 28
  8. 102
  9. 44
  10. 86
  11. 94
  12. 30
  13. 72
  14. 73
  15. 46
  16. 93
  17. 46
  18. 88
  19. 116
  20. 76
  21. 98
  22. 15
  23. 57
  24. 38
  25. 194
  26. 66
  27. 162
  28. 84
  29. 40
  30. 56
  31. 21
  32. 34
  33. 48
  34. 89
  35. 82
  36. 67
  37. 78
  38. 170
  39. 19
  40. 124

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