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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 405 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.78² =
  2. 2.63² =
  3. 3.54² =
  4. 4.82² =
  5. 5.51² =
  6. 6.91² =
  7. 7.61² =
  8. 8.79² =
  9. 9.75² =
  10. 10.71² =
  11. 11.72² =
  12. 12.65² =
  13. 13.96² =
  14. 14.94² =
  15. 15.39² =
  16. 16.98² =
  17. 17.73² =
  18. 18.41² =
  19. 19.35² =
  20. 20.85² =
  21. 21.46² =
  22. 22.47² =
  23. 23.45² =
  24. 24.89² =
  25. 25.52² =
  26. 26.37² =
  27. 27.49² =
  28. 28.64² =
  29. 29.86² =
  30. 30.76² =
  31. 31.84² =
  32. 32.58² =
  33. 33.38² =
  34. 34.32² =
  35. 35.81² =
  36. 36.42² =
  37. 37.43² =
  38. 38.93² =
  39. 39.92² =
  40. 40.31² =

Answer key

  1. 6084
  2. 3969
  3. 2916
  4. 6724
  5. 2601
  6. 8281
  7. 3721
  8. 6241
  9. 5625
  10. 5041
  11. 5184
  12. 4225
  13. 9216
  14. 8836
  15. 1521
  16. 9604
  17. 5329
  18. 1681
  19. 1225
  20. 7225
  21. 2116
  22. 2209
  23. 2025
  24. 7921
  25. 2704
  26. 1369
  27. 2401
  28. 4096
  29. 7396
  30. 5776
  31. 7056
  32. 3364
  33. 1444
  34. 1024
  35. 6561
  36. 1764
  37. 1849
  38. 8649
  39. 8464
  40. 961

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