← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 724 · 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 58 =
  2. 2.Half of 94 =
  3. 3.Double 29 =
  4. 4.Double 65 =
  5. 5.Half of 144 =
  6. 6.Double 75 =
  7. 7.Double 41 =
  8. 8.Half of 46 =
  9. 9.Half of 26 =
  10. 10.Double 46 =
  11. 11.Double 76 =
  12. 12.Half of 40 =
  13. 13.Double 35 =
  14. 14.Half of 78 =
  15. 15.Double 53 =
  16. 16.Double 23 =
  17. 17.Double 19 =
  18. 18.Half of 104 =
  19. 19.Half of 44 =
  20. 20.Half of 68 =
  21. 21.Double 99 =
  22. 22.Double 64 =
  23. 23.Half of 36 =
  24. 24.Double 55 =
  25. 25.Double 37 =
  26. 26.Half of 86 =
  27. 27.Double 86 =
  28. 28.Double 87 =
  29. 29.Half of 116 =
  30. 30.Half of 184 =
  31. 31.Half of 52 =
  32. 32.Double 79 =
  33. 33.Double 32 =
  34. 34.Double 49 =
  35. 35.Half of 180 =
  36. 36.Half of 92 =
  37. 37.Half of 90 =
  38. 38.Double 56 =
  39. 39.Half of 100 =
  40. 40.Double 73 =

Answer key

  1. 29
  2. 47
  3. 58
  4. 130
  5. 72
  6. 150
  7. 82
  8. 23
  9. 13
  10. 92
  11. 152
  12. 20
  13. 70
  14. 39
  15. 106
  16. 46
  17. 38
  18. 52
  19. 22
  20. 34
  21. 198
  22. 128
  23. 18
  24. 110
  25. 74
  26. 43
  27. 172
  28. 174
  29. 58
  30. 92
  31. 26
  32. 158
  33. 64
  34. 98
  35. 90
  36. 46
  37. 45
  38. 112
  39. 50
  40. 146

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