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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 257 · 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. 1.71² =
  2. 2.74² =
  3. 3.96² =
  4. 4.36² =
  5. 5.58² =
  6. 6.94² =
  7. 7.34² =
  8. 8.65² =
  9. 9.59² =
  10. 10.63² =
  11. 11.91² =
  12. 12.77² =
  13. 13.45² =
  14. 14.66² =
  15. 15.81² =
  16. 16.44² =
  17. 17.32² =
  18. 18.61² =
  19. 19.72² =
  20. 20.38² =
  21. 21.64² =
  22. 22.89² =
  23. 23.49² =
  24. 24.35² =
  25. 25.69² =
  26. 26.98² =
  27. 27.54² =
  28. 28.51² =
  29. 29.37² =
  30. 30.68² =
  31. 31.87² =
  32. 32.82² =
  33. 33.79² =
  34. 34.41² =
  35. 35.57² =
  36. 36.75² =
  37. 37.42² =
  38. 38.67² =
  39. 39.47² =
  40. 40.39² =

Answer key

  1. 5041
  2. 5476
  3. 9216
  4. 1296
  5. 3364
  6. 8836
  7. 1156
  8. 4225
  9. 3481
  10. 3969
  11. 8281
  12. 5929
  13. 2025
  14. 4356
  15. 6561
  16. 1936
  17. 1024
  18. 3721
  19. 5184
  20. 1444
  21. 4096
  22. 7921
  23. 2401
  24. 1225
  25. 4761
  26. 9604
  27. 2916
  28. 2601
  29. 1369
  30. 4624
  31. 7569
  32. 6724
  33. 6241
  34. 1681
  35. 3249
  36. 5625
  37. 1764
  38. 4489
  39. 2209
  40. 1521

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