← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 751 · 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 74 =
  2. 2.Half of 36 =
  3. 3.Double 98 =
  4. 4.Double 45 =
  5. 5.Double 18 =
  6. 6.Double 71 =
  7. 7.Half of 46 =
  8. 8.Half of 114 =
  9. 9.Half of 144 =
  10. 10.Double 39 =
  11. 11.Half of 134 =
  12. 12.Double 51 =
  13. 13.Double 86 =
  14. 14.Half of 142 =
  15. 15.Half of 72 =
  16. 16.Double 82 =
  17. 17.Double 73 =
  18. 18.Half of 88 =
  19. 19.Double 53 =
  20. 20.Double 72 =
  21. 21.Double 95 =
  22. 22.Half of 58 =
  23. 23.Double 66 =
  24. 24.Double 35 =
  25. 25.Half of 56 =
  26. 26.Double 16 =
  27. 27.Half of 76 =
  28. 28.Double 21 =
  29. 29.Double 78 =
  30. 30.Half of 182 =
  31. 31.Half of 110 =
  32. 32.Double 61 =
  33. 33.Double 31 =
  34. 34.Double 32 =
  35. 35.Half of 78 =
  36. 36.Half of 166 =
  37. 37.Double 23 =
  38. 38.Half of 152 =
  39. 39.Double 29 =
  40. 40.Half of 108 =

Answer key

  1. 148
  2. 18
  3. 196
  4. 90
  5. 36
  6. 142
  7. 23
  8. 57
  9. 72
  10. 78
  11. 67
  12. 102
  13. 172
  14. 71
  15. 36
  16. 164
  17. 146
  18. 44
  19. 106
  20. 144
  21. 190
  22. 29
  23. 132
  24. 70
  25. 28
  26. 32
  27. 38
  28. 42
  29. 156
  30. 91
  31. 55
  32. 122
  33. 62
  34. 64
  35. 39
  36. 83
  37. 46
  38. 76
  39. 58
  40. 54

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