← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 438 · 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 75 =
  2. 2.Half of 30 =
  3. 3.Double 44 =
  4. 4.Half of 38 =
  5. 5.Double 31 =
  6. 6.Double 62 =
  7. 7.Double 53 =
  8. 8.Double 48 =
  9. 9.Half of 184 =
  10. 10.Half of 58 =
  11. 11.Double 18 =
  12. 12.Half of 124 =
  13. 13.Half of 146 =
  14. 14.Double 64 =
  15. 15.Double 85 =
  16. 16.Double 51 =
  17. 17.Double 54 =
  18. 18.Double 21 =
  19. 19.Double 71 =
  20. 20.Double 69 =
  21. 21.Half of 130 =
  22. 22.Half of 50 =
  23. 23.Half of 46 =
  24. 24.Half of 72 =
  25. 25.Double 43 =
  26. 26.Double 83 =
  27. 27.Half of 174 =
  28. 28.Double 86 =
  29. 29.Half of 160 =
  30. 30.Half of 26 =
  31. 31.Half of 54 =
  32. 32.Double 93 =
  33. 33.Double 61 =
  34. 34.Double 29 =
  35. 35.Double 17 =
  36. 36.Double 91 =
  37. 37.Half of 52 =
  38. 38.Double 67 =
  39. 39.Half of 188 =
  40. 40.Double 74 =

Answer key

  1. 150
  2. 15
  3. 88
  4. 19
  5. 62
  6. 124
  7. 106
  8. 96
  9. 92
  10. 29
  11. 36
  12. 62
  13. 73
  14. 128
  15. 170
  16. 102
  17. 108
  18. 42
  19. 142
  20. 138
  21. 65
  22. 25
  23. 23
  24. 36
  25. 86
  26. 166
  27. 87
  28. 172
  29. 80
  30. 13
  31. 27
  32. 186
  33. 122
  34. 58
  35. 34
  36. 182
  37. 26
  38. 134
  39. 94
  40. 148

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