← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 565 · 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.Double 64 =
  3. 3.Double 68 =
  4. 4.Double 38 =
  5. 5.Double 17 =
  6. 6.Half of 28 =
  7. 7.Double 75 =
  8. 8.Double 89 =
  9. 9.Double 23 =
  10. 10.Half of 156 =
  11. 11.Half of 48 =
  12. 12.Double 41 =
  13. 13.Double 83 =
  14. 14.Half of 134 =
  15. 15.Half of 72 =
  16. 16.Double 16 =
  17. 17.Half of 152 =
  18. 18.Half of 140 =
  19. 19.Half of 94 =
  20. 20.Half of 146 =
  21. 21.Half of 30 =
  22. 22.Half of 74 =
  23. 23.Half of 150 =
  24. 24.Half of 110 =
  25. 25.Double 58 =
  26. 26.Double 81 =
  27. 27.Double 31 =
  28. 28.Double 93 =
  29. 29.Double 24 =
  30. 30.Double 21 =
  31. 31.Half of 174 =
  32. 32.Half of 98 =
  33. 33.Double 49 =
  34. 34.Half of 80 =
  35. 35.Half of 190 =
  36. 36.Half of 58 =
  37. 37.Half of 62 =
  38. 38.Half of 38 =
  39. 39.Double 42 =
  40. 40.Half of 122 =

Answer key

  1. 198
  2. 128
  3. 136
  4. 76
  5. 34
  6. 14
  7. 150
  8. 178
  9. 46
  10. 78
  11. 24
  12. 82
  13. 166
  14. 67
  15. 36
  16. 32
  17. 76
  18. 70
  19. 47
  20. 73
  21. 15
  22. 37
  23. 75
  24. 55
  25. 116
  26. 162
  27. 62
  28. 186
  29. 48
  30. 42
  31. 87
  32. 49
  33. 98
  34. 40
  35. 95
  36. 29
  37. 31
  38. 19
  39. 84
  40. 61

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