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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 537 · 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. 1.95² =
  2. 2.33² =
  3. 3.61² =
  4. 4.47² =
  5. 5.54² =
  6. 6.35² =
  7. 7.37² =
  8. 8.81² =
  9. 9.44² =
  10. 10.52² =
  11. 11.72² =
  12. 12.57² =
  13. 13.34² =
  14. 14.94² =
  15. 15.64² =
  16. 16.36² =
  17. 17.82² =
  18. 18.42² =
  19. 19.53² =
  20. 20.86² =
  21. 21.77² =
  22. 22.68² =
  23. 23.41² =
  24. 24.67² =
  25. 25.63² =
  26. 26.38² =
  27. 27.43² =
  28. 28.76² =
  29. 29.46² =
  30. 30.49² =
  31. 31.83² =
  32. 32.73² =
  33. 33.71² =
  34. 34.91² =
  35. 35.85² =
  36. 36.58² =
  37. 37.88² =
  38. 38.99² =
  39. 39.48² =
  40. 40.78² =

Answer key

  1. 9025
  2. 1089
  3. 3721
  4. 2209
  5. 2916
  6. 1225
  7. 1369
  8. 6561
  9. 1936
  10. 2704
  11. 5184
  12. 3249
  13. 1156
  14. 8836
  15. 4096
  16. 1296
  17. 6724
  18. 1764
  19. 2809
  20. 7396
  21. 5929
  22. 4624
  23. 1681
  24. 4489
  25. 3969
  26. 1444
  27. 1849
  28. 5776
  29. 2116
  30. 2401
  31. 6889
  32. 5329
  33. 5041
  34. 8281
  35. 7225
  36. 3364
  37. 7744
  38. 9801
  39. 2304
  40. 6084

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