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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 26 · 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 73 =
  2. 2.Double 22 =
  3. 3.Double 89 =
  4. 4.Half of 28 =
  5. 5.Double 76 =
  6. 6.Double 91 =
  7. 7.Half of 172 =
  8. 8.Half of 156 =
  9. 9.Double 31 =
  10. 10.Double 23 =
  11. 11.Double 38 =
  12. 12.Double 17 =
  13. 13.Double 99 =
  14. 14.Double 32 =
  15. 15.Half of 30 =
  16. 16.Double 52 =
  17. 17.Double 86 =
  18. 18.Half of 50 =
  19. 19.Half of 38 =
  20. 20.Half of 106 =
  21. 21.Double 88 =
  22. 22.Half of 46 =
  23. 23.Double 45 =
  24. 24.Double 98 =
  25. 25.Half of 112 =
  26. 26.Half of 126 =
  27. 27.Half of 128 =
  28. 28.Half of 48 =
  29. 29.Double 81 =
  30. 30.Half of 102 =
  31. 31.Half of 124 =
  32. 32.Double 41 =
  33. 33.Double 16 =
  34. 34.Half of 80 =
  35. 35.Half of 192 =
  36. 36.Half of 76 =
  37. 37.Double 35 =
  38. 38.Half of 70 =
  39. 39.Double 78 =
  40. 40.Double 64 =

Answer key

  1. 146
  2. 44
  3. 178
  4. 14
  5. 152
  6. 182
  7. 86
  8. 78
  9. 62
  10. 46
  11. 76
  12. 34
  13. 198
  14. 64
  15. 15
  16. 104
  17. 172
  18. 25
  19. 19
  20. 53
  21. 176
  22. 23
  23. 90
  24. 196
  25. 56
  26. 63
  27. 64
  28. 24
  29. 162
  30. 51
  31. 62
  32. 82
  33. 32
  34. 40
  35. 96
  36. 38
  37. 70
  38. 35
  39. 156
  40. 128

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