← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 589 · 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 82 =
  2. 2.Half of 42 =
  3. 3.Double 35 =
  4. 4.Half of 68 =
  5. 5.Half of 92 =
  6. 6.Half of 176 =
  7. 7.Double 18 =
  8. 8.Double 32 =
  9. 9.Half of 180 =
  10. 10.Double 67 =
  11. 11.Double 56 =
  12. 12.Double 49 =
  13. 13.Half of 166 =
  14. 14.Double 96 =
  15. 15.Double 21 =
  16. 16.Half of 48 =
  17. 17.Half of 50 =
  18. 18.Half of 40 =
  19. 19.Double 33 =
  20. 20.Half of 84 =
  21. 21.Double 28 =
  22. 22.Half of 54 =
  23. 23.Double 95 =
  24. 24.Double 62 =
  25. 25.Half of 192 =
  26. 26.Double 23 =
  27. 27.Double 79 =
  28. 28.Half of 102 =
  29. 29.Double 19 =
  30. 30.Double 91 =
  31. 31.Double 16 =
  32. 32.Double 98 =
  33. 33.Half of 36 =
  34. 34.Double 76 =
  35. 35.Double 93 =
  36. 36.Double 44 =
  37. 37.Double 47 =
  38. 38.Half of 142 =
  39. 39.Half of 82 =
  40. 40.Double 39 =

Answer key

  1. 164
  2. 21
  3. 70
  4. 34
  5. 46
  6. 88
  7. 36
  8. 64
  9. 90
  10. 134
  11. 112
  12. 98
  13. 83
  14. 192
  15. 42
  16. 24
  17. 25
  18. 20
  19. 66
  20. 42
  21. 56
  22. 27
  23. 190
  24. 124
  25. 96
  26. 46
  27. 158
  28. 51
  29. 38
  30. 182
  31. 32
  32. 196
  33. 18
  34. 152
  35. 186
  36. 88
  37. 94
  38. 71
  39. 41
  40. 78

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