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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 470 · 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 99 =
  2. 2.Half of 178 =
  3. 3.Double 79 =
  4. 4.Half of 40 =
  5. 5.Half of 198 =
  6. 6.Double 83 =
  7. 7.Double 44 =
  8. 8.Double 54 =
  9. 9.Double 31 =
  10. 10.Double 74 =
  11. 11.Double 81 =
  12. 12.Half of 168 =
  13. 13.Double 42 =
  14. 14.Double 62 =
  15. 15.Double 66 =
  16. 16.Half of 116 =
  17. 17.Double 75 =
  18. 18.Double 77 =
  19. 19.Double 94 =
  20. 20.Double 65 =
  21. 21.Double 38 =
  22. 22.Double 61 =
  23. 23.Half of 170 =
  24. 24.Double 91 =
  25. 25.Half of 90 =
  26. 26.Double 53 =
  27. 27.Half of 80 =
  28. 28.Half of 36 =
  29. 29.Half of 190 =
  30. 30.Double 72 =
  31. 31.Double 34 =
  32. 32.Half of 196 =
  33. 33.Double 41 =
  34. 34.Half of 138 =
  35. 35.Double 43 =
  36. 36.Half of 160 =
  37. 37.Double 59 =
  38. 38.Half of 156 =
  39. 39.Double 29 =
  40. 40.Double 87 =

Answer key

  1. 198
  2. 89
  3. 158
  4. 20
  5. 99
  6. 166
  7. 88
  8. 108
  9. 62
  10. 148
  11. 162
  12. 84
  13. 84
  14. 124
  15. 132
  16. 58
  17. 150
  18. 154
  19. 188
  20. 130
  21. 76
  22. 122
  23. 85
  24. 182
  25. 45
  26. 106
  27. 40
  28. 18
  29. 95
  30. 144
  31. 68
  32. 98
  33. 82
  34. 69
  35. 86
  36. 80
  37. 118
  38. 78
  39. 58
  40. 174

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