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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 153 · 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 69 =
  2. 2.Double 33 =
  3. 3.Half of 88 =
  4. 4.Half of 150 =
  5. 5.Double 23 =
  6. 6.Half of 64 =
  7. 7.Double 91 =
  8. 8.Double 17 =
  9. 9.Half of 160 =
  10. 10.Double 54 =
  11. 11.Half of 32 =
  12. 12.Double 99 =
  13. 13.Double 55 =
  14. 14.Half of 154 =
  15. 15.Double 81 =
  16. 16.Half of 176 =
  17. 17.Half of 86 =
  18. 18.Half of 188 =
  19. 19.Half of 142 =
  20. 20.Double 31 =
  21. 21.Double 84 =
  22. 22.Double 24 =
  23. 23.Half of 180 =
  24. 24.Double 29 =
  25. 25.Half of 178 =
  26. 26.Double 58 =
  27. 27.Double 49 =
  28. 28.Double 96 =
  29. 29.Double 43 =
  30. 30.Double 26 =
  31. 31.Half of 34 =
  32. 32.Double 18 =
  33. 33.Double 62 =
  34. 34.Double 87 =
  35. 35.Half of 66 =
  36. 36.Half of 58 =
  37. 37.Double 63 =
  38. 38.Double 65 =
  39. 39.Half of 36 =
  40. 40.Half of 148 =

Answer key

  1. 138
  2. 66
  3. 44
  4. 75
  5. 46
  6. 32
  7. 182
  8. 34
  9. 80
  10. 108
  11. 16
  12. 198
  13. 110
  14. 77
  15. 162
  16. 88
  17. 43
  18. 94
  19. 71
  20. 62
  21. 168
  22. 48
  23. 90
  24. 58
  25. 89
  26. 116
  27. 98
  28. 192
  29. 86
  30. 52
  31. 17
  32. 36
  33. 124
  34. 174
  35. 33
  36. 29
  37. 126
  38. 130
  39. 18
  40. 74

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