← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 971 · 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 63 =
  2. 2.Double 18 =
  3. 3.Double 56 =
  4. 4.Half of 70 =
  5. 5.Double 31 =
  6. 6.Double 16 =
  7. 7.Half of 38 =
  8. 8.Double 97 =
  9. 9.Half of 174 =
  10. 10.Double 57 =
  11. 11.Half of 74 =
  12. 12.Half of 196 =
  13. 13.Double 99 =
  14. 14.Half of 154 =
  15. 15.Double 27 =
  16. 16.Half of 62 =
  17. 17.Double 78 =
  18. 18.Half of 60 =
  19. 19.Double 88 =
  20. 20.Half of 76 =
  21. 21.Half of 186 =
  22. 22.Double 38 =
  23. 23.Half of 190 =
  24. 24.Half of 100 =
  25. 25.Double 68 =
  26. 26.Double 28 =
  27. 27.Double 62 =
  28. 28.Half of 118 =
  29. 29.Double 33 =
  30. 30.Half of 112 =
  31. 31.Half of 86 =
  32. 32.Half of 26 =
  33. 33.Double 65 =
  34. 34.Half of 158 =
  35. 35.Double 23 =
  36. 36.Double 96 =
  37. 37.Half of 114 =
  38. 38.Double 71 =
  39. 39.Double 32 =
  40. 40.Half of 116 =

Answer key

  1. 126
  2. 36
  3. 112
  4. 35
  5. 62
  6. 32
  7. 19
  8. 194
  9. 87
  10. 114
  11. 37
  12. 98
  13. 198
  14. 77
  15. 54
  16. 31
  17. 156
  18. 30
  19. 176
  20. 38
  21. 93
  22. 76
  23. 95
  24. 50
  25. 136
  26. 56
  27. 124
  28. 59
  29. 66
  30. 56
  31. 43
  32. 13
  33. 130
  34. 79
  35. 46
  36. 192
  37. 57
  38. 142
  39. 64
  40. 58

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