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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 696 · 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 23 =
  2. 2.Half of 26 =
  3. 3.Double 51 =
  4. 4.Half of 154 =
  5. 5.Double 59 =
  6. 6.Half of 56 =
  7. 7.Double 63 =
  8. 8.Half of 80 =
  9. 9.Double 77 =
  10. 10.Half of 70 =
  11. 11.Half of 144 =
  12. 12.Double 85 =
  13. 13.Half of 38 =
  14. 14.Half of 34 =
  15. 15.Half of 136 =
  16. 16.Double 74 =
  17. 17.Half of 152 =
  18. 18.Double 95 =
  19. 19.Double 33 =
  20. 20.Half of 160 =
  21. 21.Half of 162 =
  22. 22.Half of 138 =
  23. 23.Half of 198 =
  24. 24.Double 81 =
  25. 25.Double 35 =
  26. 26.Double 91 =
  27. 27.Double 25 =
  28. 28.Double 32 =
  29. 29.Half of 58 =
  30. 30.Half of 74 =
  31. 31.Half of 182 =
  32. 32.Half of 124 =
  33. 33.Double 73 =
  34. 34.Double 52 =
  35. 35.Double 19 =
  36. 36.Double 64 =
  37. 37.Double 97 =
  38. 38.Half of 98 =
  39. 39.Half of 66 =
  40. 40.Double 98 =

Answer key

  1. 46
  2. 13
  3. 102
  4. 77
  5. 118
  6. 28
  7. 126
  8. 40
  9. 154
  10. 35
  11. 72
  12. 170
  13. 19
  14. 17
  15. 68
  16. 148
  17. 76
  18. 190
  19. 66
  20. 80
  21. 81
  22. 69
  23. 99
  24. 162
  25. 70
  26. 182
  27. 50
  28. 64
  29. 29
  30. 37
  31. 91
  32. 62
  33. 146
  34. 104
  35. 38
  36. 128
  37. 194
  38. 49
  39. 33
  40. 196

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