← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 831 · 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 168 =
  2. 2.Double 71 =
  3. 3.Double 96 =
  4. 4.Half of 60 =
  5. 5.Half of 104 =
  6. 6.Double 72 =
  7. 7.Half of 100 =
  8. 8.Double 56 =
  9. 9.Double 59 =
  10. 10.Half of 86 =
  11. 11.Half of 44 =
  12. 12.Double 52 =
  13. 13.Half of 178 =
  14. 14.Double 87 =
  15. 15.Double 94 =
  16. 16.Double 81 =
  17. 17.Half of 180 =
  18. 18.Double 92 =
  19. 19.Half of 114 =
  20. 20.Double 16 =
  21. 21.Half of 166 =
  22. 22.Double 62 =
  23. 23.Half of 162 =
  24. 24.Half of 182 =
  25. 25.Double 83 =
  26. 26.Double 54 =
  27. 27.Double 63 =
  28. 28.Double 93 =
  29. 29.Half of 102 =
  30. 30.Double 78 =
  31. 31.Double 28 =
  32. 32.Double 39 =
  33. 33.Half of 46 =
  34. 34.Double 21 =
  35. 35.Half of 70 =
  36. 36.Half of 192 =
  37. 37.Half of 40 =
  38. 38.Double 44 =
  39. 39.Half of 198 =
  40. 40.Half of 84 =

Answer key

  1. 84
  2. 142
  3. 192
  4. 30
  5. 52
  6. 144
  7. 50
  8. 112
  9. 118
  10. 43
  11. 22
  12. 104
  13. 89
  14. 174
  15. 188
  16. 162
  17. 90
  18. 184
  19. 57
  20. 32
  21. 83
  22. 124
  23. 81
  24. 91
  25. 166
  26. 108
  27. 126
  28. 186
  29. 51
  30. 156
  31. 56
  32. 78
  33. 23
  34. 42
  35. 35
  36. 96
  37. 20
  38. 88
  39. 99
  40. 42

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