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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 942 · 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 76 =
  2. 2.Double 41 =
  3. 3.Half of 172 =
  4. 4.Half of 128 =
  5. 5.Half of 156 =
  6. 6.Half of 196 =
  7. 7.Half of 194 =
  8. 8.Double 72 =
  9. 9.Half of 86 =
  10. 10.Half of 178 =
  11. 11.Double 47 =
  12. 12.Double 94 =
  13. 13.Double 73 =
  14. 14.Double 84 =
  15. 15.Half of 90 =
  16. 16.Double 22 =
  17. 17.Double 17 =
  18. 18.Double 92 =
  19. 19.Double 49 =
  20. 20.Half of 32 =
  21. 21.Half of 132 =
  22. 22.Double 95 =
  23. 23.Double 93 =
  24. 24.Double 54 =
  25. 25.Half of 48 =
  26. 26.Double 34 =
  27. 27.Double 97 =
  28. 28.Double 78 =
  29. 29.Double 27 =
  30. 30.Half of 100 =
  31. 31.Half of 84 =
  32. 32.Double 35 =
  33. 33.Double 32 =
  34. 34.Half of 166 =
  35. 35.Half of 52 =
  36. 36.Half of 162 =
  37. 37.Double 56 =
  38. 38.Half of 146 =
  39. 39.Half of 78 =
  40. 40.Double 18 =

Answer key

  1. 152
  2. 82
  3. 86
  4. 64
  5. 78
  6. 98
  7. 97
  8. 144
  9. 43
  10. 89
  11. 94
  12. 188
  13. 146
  14. 168
  15. 45
  16. 44
  17. 34
  18. 184
  19. 98
  20. 16
  21. 66
  22. 190
  23. 186
  24. 108
  25. 24
  26. 68
  27. 194
  28. 156
  29. 54
  30. 50
  31. 42
  32. 70
  33. 64
  34. 83
  35. 26
  36. 81
  37. 112
  38. 73
  39. 39
  40. 36

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