← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 301 · 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 82 =
  2. 2.Double 35 =
  3. 3.Half of 156 =
  4. 4.Double 61 =
  5. 5.Half of 128 =
  6. 6.Half of 104 =
  7. 7.Double 46 =
  8. 8.Half of 64 =
  9. 9.Half of 140 =
  10. 10.Double 89 =
  11. 11.Half of 56 =
  12. 12.Double 27 =
  13. 13.Half of 38 =
  14. 14.Half of 130 =
  15. 15.Double 63 =
  16. 16.Double 41 =
  17. 17.Double 21 =
  18. 18.Half of 110 =
  19. 19.Half of 68 =
  20. 20.Double 98 =
  21. 21.Double 45 =
  22. 22.Half of 58 =
  23. 23.Half of 150 =
  24. 24.Half of 34 =
  25. 25.Double 81 =
  26. 26.Double 95 =
  27. 27.Double 24 =
  28. 28.Half of 44 =
  29. 29.Double 52 =
  30. 30.Double 99 =
  31. 31.Half of 190 =
  32. 32.Half of 122 =
  33. 33.Double 16 =
  34. 34.Double 88 =
  35. 35.Half of 138 =
  36. 36.Half of 72 =
  37. 37.Double 71 =
  38. 38.Half of 158 =
  39. 39.Half of 86 =
  40. 40.Double 51 =

Answer key

  1. 41
  2. 70
  3. 78
  4. 122
  5. 64
  6. 52
  7. 92
  8. 32
  9. 70
  10. 178
  11. 28
  12. 54
  13. 19
  14. 65
  15. 126
  16. 82
  17. 42
  18. 55
  19. 34
  20. 196
  21. 90
  22. 29
  23. 75
  24. 17
  25. 162
  26. 190
  27. 48
  28. 22
  29. 104
  30. 198
  31. 95
  32. 61
  33. 32
  34. 176
  35. 69
  36. 36
  37. 142
  38. 79
  39. 43
  40. 102

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