← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 906 · 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.Half of 158 =
  2. 2.Half of 174 =
  3. 3.Double 79 =
  4. 4.Half of 190 =
  5. 5.Half of 74 =
  6. 6.Double 21 =
  7. 7.Double 29 =
  8. 8.Double 19 =
  9. 9.Half of 46 =
  10. 10.Double 26 =
  11. 11.Half of 64 =
  12. 12.Double 49 =
  13. 13.Half of 128 =
  14. 14.Half of 62 =
  15. 15.Double 69 =
  16. 16.Half of 194 =
  17. 17.Double 84 =
  18. 18.Half of 54 =
  19. 19.Double 92 =
  20. 20.Half of 94 =
  21. 21.Double 73 =
  22. 22.Half of 188 =
  23. 23.Half of 140 =
  24. 24.Double 43 =
  25. 25.Double 42 =
  26. 26.Half of 26 =
  27. 27.Half of 88 =
  28. 28.Half of 96 =
  29. 29.Double 76 =
  30. 30.Double 41 =
  31. 31.Double 94 =
  32. 32.Half of 152 =
  33. 33.Half of 72 =
  34. 34.Half of 124 =
  35. 35.Half of 186 =
  36. 36.Double 18 =
  37. 37.Half of 52 =
  38. 38.Double 36 =
  39. 39.Half of 168 =
  40. 40.Double 34 =

Answer key

  1. 79
  2. 87
  3. 158
  4. 95
  5. 37
  6. 42
  7. 58
  8. 38
  9. 23
  10. 52
  11. 32
  12. 98
  13. 64
  14. 31
  15. 138
  16. 97
  17. 168
  18. 27
  19. 184
  20. 47
  21. 146
  22. 94
  23. 70
  24. 86
  25. 84
  26. 13
  27. 44
  28. 48
  29. 152
  30. 82
  31. 188
  32. 76
  33. 36
  34. 62
  35. 93
  36. 36
  37. 26
  38. 72
  39. 84
  40. 68

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths