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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 251 · 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 91 =
  2. 2.Double 78 =
  3. 3.Half of 130 =
  4. 4.Double 52 =
  5. 5.Half of 90 =
  6. 6.Half of 76 =
  7. 7.Double 61 =
  8. 8.Double 21 =
  9. 9.Double 92 =
  10. 10.Double 76 =
  11. 11.Double 97 =
  12. 12.Double 56 =
  13. 13.Double 44 =
  14. 14.Half of 180 =
  15. 15.Double 23 =
  16. 16.Half of 138 =
  17. 17.Double 99 =
  18. 18.Double 93 =
  19. 19.Half of 52 =
  20. 20.Double 87 =
  21. 21.Half of 34 =
  22. 22.Half of 144 =
  23. 23.Half of 94 =
  24. 24.Double 19 =
  25. 25.Double 53 =
  26. 26.Half of 170 =
  27. 27.Double 33 =
  28. 28.Double 96 =
  29. 29.Double 49 =
  30. 30.Double 29 =
  31. 31.Double 55 =
  32. 32.Double 51 =
  33. 33.Double 41 =
  34. 34.Double 63 =
  35. 35.Double 79 =
  36. 36.Double 46 =
  37. 37.Double 48 =
  38. 38.Double 32 =
  39. 39.Half of 56 =
  40. 40.Half of 154 =

Answer key

  1. 182
  2. 156
  3. 65
  4. 104
  5. 45
  6. 38
  7. 122
  8. 42
  9. 184
  10. 152
  11. 194
  12. 112
  13. 88
  14. 90
  15. 46
  16. 69
  17. 198
  18. 186
  19. 26
  20. 174
  21. 17
  22. 72
  23. 47
  24. 38
  25. 106
  26. 85
  27. 66
  28. 192
  29. 98
  30. 58
  31. 110
  32. 102
  33. 82
  34. 126
  35. 158
  36. 92
  37. 96
  38. 64
  39. 28
  40. 77

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