← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 722 · 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 27 =
  2. 2.Half of 116 =
  3. 3.Double 92 =
  4. 4.Half of 36 =
  5. 5.Half of 154 =
  6. 6.Half of 42 =
  7. 7.Double 49 =
  8. 8.Half of 52 =
  9. 9.Double 96 =
  10. 10.Half of 138 =
  11. 11.Half of 150 =
  12. 12.Double 21 =
  13. 13.Half of 136 =
  14. 14.Double 69 =
  15. 15.Half of 86 =
  16. 16.Double 78 =
  17. 17.Double 88 =
  18. 18.Double 37 =
  19. 19.Double 31 =
  20. 20.Half of 50 =
  21. 21.Double 24 =
  22. 22.Half of 74 =
  23. 23.Half of 96 =
  24. 24.Half of 82 =
  25. 25.Half of 58 =
  26. 26.Half of 60 =
  27. 27.Double 51 =
  28. 28.Double 65 =
  29. 29.Half of 66 =
  30. 30.Half of 172 =
  31. 31.Double 79 =
  32. 32.Double 46 =
  33. 33.Double 72 =
  34. 34.Double 63 =
  35. 35.Half of 148 =
  36. 36.Double 28 =
  37. 37.Half of 88 =
  38. 38.Half of 98 =
  39. 39.Double 87 =
  40. 40.Double 81 =

Answer key

  1. 54
  2. 58
  3. 184
  4. 18
  5. 77
  6. 21
  7. 98
  8. 26
  9. 192
  10. 69
  11. 75
  12. 42
  13. 68
  14. 138
  15. 43
  16. 156
  17. 176
  18. 74
  19. 62
  20. 25
  21. 48
  22. 37
  23. 48
  24. 41
  25. 29
  26. 30
  27. 102
  28. 130
  29. 33
  30. 86
  31. 158
  32. 92
  33. 144
  34. 126
  35. 74
  36. 56
  37. 44
  38. 49
  39. 174
  40. 162

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