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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 650 · 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 88 =
  2. 2.Double 21 =
  3. 3.Half of 26 =
  4. 4.Half of 34 =
  5. 5.Double 57 =
  6. 6.Double 52 =
  7. 7.Double 56 =
  8. 8.Half of 176 =
  9. 9.Double 45 =
  10. 10.Double 65 =
  11. 11.Half of 90 =
  12. 12.Double 44 =
  13. 13.Half of 92 =
  14. 14.Half of 76 =
  15. 15.Double 27 =
  16. 16.Half of 154 =
  17. 17.Double 58 =
  18. 18.Double 72 =
  19. 19.Half of 36 =
  20. 20.Double 47 =
  21. 21.Double 84 =
  22. 22.Half of 174 =
  23. 23.Double 98 =
  24. 24.Half of 70 =
  25. 25.Double 22 =
  26. 26.Double 79 =
  27. 27.Double 23 =
  28. 28.Half of 164 =
  29. 29.Half of 190 =
  30. 30.Double 99 =
  31. 31.Half of 62 =
  32. 32.Double 16 =
  33. 33.Half of 94 =
  34. 34.Half of 172 =
  35. 35.Half of 124 =
  36. 36.Half of 60 =
  37. 37.Double 78 =
  38. 38.Half of 162 =
  39. 39.Double 29 =
  40. 40.Double 46 =

Answer key

  1. 176
  2. 42
  3. 13
  4. 17
  5. 114
  6. 104
  7. 112
  8. 88
  9. 90
  10. 130
  11. 45
  12. 88
  13. 46
  14. 38
  15. 54
  16. 77
  17. 116
  18. 144
  19. 18
  20. 94
  21. 168
  22. 87
  23. 196
  24. 35
  25. 44
  26. 158
  27. 46
  28. 82
  29. 95
  30. 198
  31. 31
  32. 32
  33. 47
  34. 86
  35. 62
  36. 30
  37. 156
  38. 81
  39. 58
  40. 92

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