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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 461 · 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. 1.57² =
  2. 2.43² =
  3. 3.76² =
  4. 4.54² =
  5. 5.52² =
  6. 6.59² =
  7. 7.47² =
  8. 8.91² =
  9. 9.39² =
  10. 10.49² =
  11. 11.67² =
  12. 12.86² =
  13. 13.37² =
  14. 14.99² =
  15. 15.51² =
  16. 16.32² =
  17. 17.44² =
  18. 18.58² =
  19. 19.41² =
  20. 20.33² =
  21. 21.81² =
  22. 22.31² =
  23. 23.78² =
  24. 24.46² =
  25. 25.85² =
  26. 26.73² =
  27. 27.77² =
  28. 28.98² =
  29. 29.68² =
  30. 30.89² =
  31. 31.38² =
  32. 32.74² =
  33. 33.61² =
  34. 34.62² =
  35. 35.42² =
  36. 36.48² =
  37. 37.34² =
  38. 38.96² =
  39. 39.71² =
  40. 40.92² =

Answer key

  1. 3249
  2. 1849
  3. 5776
  4. 2916
  5. 2704
  6. 3481
  7. 2209
  8. 8281
  9. 1521
  10. 2401
  11. 4489
  12. 7396
  13. 1369
  14. 9801
  15. 2601
  16. 1024
  17. 1936
  18. 3364
  19. 1681
  20. 1089
  21. 6561
  22. 961
  23. 6084
  24. 2116
  25. 7225
  26. 5329
  27. 5929
  28. 9604
  29. 4624
  30. 7921
  31. 1444
  32. 5476
  33. 3721
  34. 3844
  35. 1764
  36. 2304
  37. 1156
  38. 9216
  39. 5041
  40. 8464

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