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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 808 · 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.Half of 96 =
  3. 3.Half of 182 =
  4. 4.Half of 194 =
  5. 5.Half of 180 =
  6. 6.Double 92 =
  7. 7.Double 43 =
  8. 8.Double 94 =
  9. 9.Double 71 =
  10. 10.Half of 176 =
  11. 11.Half of 42 =
  12. 12.Half of 102 =
  13. 13.Double 69 =
  14. 14.Double 35 =
  15. 15.Double 97 =
  16. 16.Double 98 =
  17. 17.Double 79 =
  18. 18.Half of 26 =
  19. 19.Double 68 =
  20. 20.Double 32 =
  21. 21.Double 38 =
  22. 22.Double 16 =
  23. 23.Double 27 =
  24. 24.Half of 120 =
  25. 25.Half of 152 =
  26. 26.Half of 92 =
  27. 27.Half of 94 =
  28. 28.Double 93 =
  29. 29.Half of 116 =
  30. 30.Half of 158 =
  31. 31.Double 21 =
  32. 32.Double 31 =
  33. 33.Double 53 =
  34. 34.Half of 196 =
  35. 35.Half of 106 =
  36. 36.Half of 80 =
  37. 37.Half of 150 =
  38. 38.Double 37 =
  39. 39.Double 91 =
  40. 40.Half of 118 =

Answer key

  1. 146
  2. 48
  3. 91
  4. 97
  5. 90
  6. 184
  7. 86
  8. 188
  9. 142
  10. 88
  11. 21
  12. 51
  13. 138
  14. 70
  15. 194
  16. 196
  17. 158
  18. 13
  19. 136
  20. 64
  21. 76
  22. 32
  23. 54
  24. 60
  25. 76
  26. 46
  27. 47
  28. 186
  29. 58
  30. 79
  31. 42
  32. 62
  33. 106
  34. 98
  35. 53
  36. 40
  37. 75
  38. 74
  39. 182
  40. 59

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