← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 18 · 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 97 =
  2. 2.Double 26 =
  3. 3.Double 88 =
  4. 4.Double 36 =
  5. 5.Half of 166 =
  6. 6.Double 51 =
  7. 7.Half of 28 =
  8. 8.Half of 118 =
  9. 9.Double 21 =
  10. 10.Half of 92 =
  11. 11.Double 48 =
  12. 12.Double 91 =
  13. 13.Double 22 =
  14. 14.Double 63 =
  15. 15.Double 66 =
  16. 16.Half of 160 =
  17. 17.Half of 116 =
  18. 18.Half of 82 =
  19. 19.Half of 130 =
  20. 20.Double 82 =
  21. 21.Half of 34 =
  22. 22.Half of 148 =
  23. 23.Double 33 =
  24. 24.Double 31 =
  25. 25.Double 24 =
  26. 26.Half of 62 =
  27. 27.Double 71 =
  28. 28.Half of 72 =
  29. 29.Half of 76 =
  30. 30.Double 72 =
  31. 31.Double 95 =
  32. 32.Half of 80 =
  33. 33.Half of 124 =
  34. 34.Double 56 =
  35. 35.Double 17 =
  36. 36.Double 99 =
  37. 37.Half of 64 =
  38. 38.Double 46 =
  39. 39.Half of 102 =
  40. 40.Half of 58 =

Answer key

  1. 194
  2. 52
  3. 176
  4. 72
  5. 83
  6. 102
  7. 14
  8. 59
  9. 42
  10. 46
  11. 96
  12. 182
  13. 44
  14. 126
  15. 132
  16. 80
  17. 58
  18. 41
  19. 65
  20. 164
  21. 17
  22. 74
  23. 66
  24. 62
  25. 48
  26. 31
  27. 142
  28. 36
  29. 38
  30. 144
  31. 190
  32. 40
  33. 62
  34. 112
  35. 34
  36. 198
  37. 32
  38. 92
  39. 51
  40. 29

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