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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 15 · 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 92 =
  2. 2.Double 97 =
  3. 3.Double 24 =
  4. 4.Double 69 =
  5. 5.Half of 84 =
  6. 6.Double 39 =
  7. 7.Half of 140 =
  8. 8.Half of 198 =
  9. 9.Half of 126 =
  10. 10.Half of 142 =
  11. 11.Half of 36 =
  12. 12.Double 94 =
  13. 13.Half of 64 =
  14. 14.Double 23 =
  15. 15.Half of 34 =
  16. 16.Double 47 =
  17. 17.Half of 162 =
  18. 18.Double 26 =
  19. 19.Double 18 =
  20. 20.Double 93 =
  21. 21.Half of 96 =
  22. 22.Double 28 =
  23. 23.Double 73 =
  24. 24.Half of 100 =
  25. 25.Half of 112 =
  26. 26.Double 84 =
  27. 27.Double 87 =
  28. 28.Double 46 =
  29. 29.Double 16 =
  30. 30.Half of 110 =
  31. 31.Half of 160 =
  32. 32.Double 63 =
  33. 33.Half of 42 =
  34. 34.Half of 74 =
  35. 35.Half of 148 =
  36. 36.Double 78 =
  37. 37.Double 91 =
  38. 38.Half of 28 =
  39. 39.Half of 130 =
  40. 40.Double 56 =

Answer key

  1. 46
  2. 194
  3. 48
  4. 138
  5. 42
  6. 78
  7. 70
  8. 99
  9. 63
  10. 71
  11. 18
  12. 188
  13. 32
  14. 46
  15. 17
  16. 94
  17. 81
  18. 52
  19. 36
  20. 186
  21. 48
  22. 56
  23. 146
  24. 50
  25. 56
  26. 168
  27. 174
  28. 92
  29. 32
  30. 55
  31. 80
  32. 126
  33. 21
  34. 37
  35. 74
  36. 156
  37. 182
  38. 14
  39. 65
  40. 112

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