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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 713 · 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 98 =
  2. 2.Half of 56 =
  3. 3.Double 69 =
  4. 4.Half of 68 =
  5. 5.Double 34 =
  6. 6.Half of 88 =
  7. 7.Double 74 =
  8. 8.Double 91 =
  9. 9.Half of 160 =
  10. 10.Half of 44 =
  11. 11.Double 59 =
  12. 12.Double 24 =
  13. 13.Double 21 =
  14. 14.Double 94 =
  15. 15.Half of 132 =
  16. 16.Half of 42 =
  17. 17.Half of 82 =
  18. 18.Half of 188 =
  19. 19.Double 62 =
  20. 20.Double 84 =
  21. 21.Half of 38 =
  22. 22.Double 32 =
  23. 23.Double 73 =
  24. 24.Half of 134 =
  25. 25.Double 61 =
  26. 26.Half of 80 =
  27. 27.Double 77 =
  28. 28.Double 18 =
  29. 29.Half of 196 =
  30. 30.Half of 192 =
  31. 31.Half of 166 =
  32. 32.Double 38 =
  33. 33.Double 51 =
  34. 34.Half of 26 =
  35. 35.Double 99 =
  36. 36.Double 86 =
  37. 37.Double 17 =
  38. 38.Half of 62 =
  39. 39.Double 45 =
  40. 40.Double 27 =

Answer key

  1. 196
  2. 28
  3. 138
  4. 34
  5. 68
  6. 44
  7. 148
  8. 182
  9. 80
  10. 22
  11. 118
  12. 48
  13. 42
  14. 188
  15. 66
  16. 21
  17. 41
  18. 94
  19. 124
  20. 168
  21. 19
  22. 64
  23. 146
  24. 67
  25. 122
  26. 40
  27. 154
  28. 36
  29. 98
  30. 96
  31. 83
  32. 76
  33. 102
  34. 13
  35. 198
  36. 172
  37. 34
  38. 31
  39. 90
  40. 54

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