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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 282 · 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 102 =
  2. 2.Double 38 =
  3. 3.Double 84 =
  4. 4.Half of 138 =
  5. 5.Half of 150 =
  6. 6.Double 87 =
  7. 7.Half of 184 =
  8. 8.Half of 92 =
  9. 9.Double 97 =
  10. 10.Double 33 =
  11. 11.Half of 176 =
  12. 12.Double 76 =
  13. 13.Double 32 =
  14. 14.Double 91 =
  15. 15.Half of 142 =
  16. 16.Double 24 =
  17. 17.Double 72 =
  18. 18.Double 29 =
  19. 19.Half of 98 =
  20. 20.Half of 58 =
  21. 21.Half of 38 =
  22. 22.Half of 110 =
  23. 23.Half of 74 =
  24. 24.Half of 158 =
  25. 25.Double 82 =
  26. 26.Half of 120 =
  27. 27.Double 92 =
  28. 28.Half of 126 =
  29. 29.Double 71 =
  30. 30.Half of 42 =
  31. 31.Double 49 =
  32. 32.Double 25 =
  33. 33.Double 95 =
  34. 34.Half of 152 =
  35. 35.Double 74 =
  36. 36.Half of 128 =
  37. 37.Double 47 =
  38. 38.Half of 68 =
  39. 39.Half of 48 =
  40. 40.Half of 144 =

Answer key

  1. 51
  2. 76
  3. 168
  4. 69
  5. 75
  6. 174
  7. 92
  8. 46
  9. 194
  10. 66
  11. 88
  12. 152
  13. 64
  14. 182
  15. 71
  16. 48
  17. 144
  18. 58
  19. 49
  20. 29
  21. 19
  22. 55
  23. 37
  24. 79
  25. 164
  26. 60
  27. 184
  28. 63
  29. 142
  30. 21
  31. 98
  32. 50
  33. 190
  34. 76
  35. 148
  36. 64
  37. 94
  38. 34
  39. 24
  40. 72

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