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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 317 · 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. 1.85² =
  2. 2.74² =
  3. 3.81² =
  4. 4.39² =
  5. 5.97² =
  6. 6.48² =
  7. 7.59² =
  8. 8.67² =
  9. 9.64² =
  10. 10.54² =
  11. 11.61² =
  12. 12.53² =
  13. 13.36² =
  14. 14.56² =
  15. 15.35² =
  16. 16.41² =
  17. 17.37² =
  18. 18.51² =
  19. 19.34² =
  20. 20.46² =
  21. 21.92² =
  22. 22.45² =
  23. 23.79² =
  24. 24.91² =
  25. 25.31² =
  26. 26.68² =
  27. 27.89² =
  28. 28.42² =
  29. 29.44² =
  30. 30.96² =
  31. 31.43² =
  32. 32.87² =
  33. 33.38² =
  34. 34.63² =
  35. 35.66² =
  36. 36.58² =
  37. 37.47² =
  38. 38.52² =
  39. 39.71² =
  40. 40.93² =

Answer key

  1. 7225
  2. 5476
  3. 6561
  4. 1521
  5. 9409
  6. 2304
  7. 3481
  8. 4489
  9. 4096
  10. 2916
  11. 3721
  12. 2809
  13. 1296
  14. 3136
  15. 1225
  16. 1681
  17. 1369
  18. 2601
  19. 1156
  20. 2116
  21. 8464
  22. 2025
  23. 6241
  24. 8281
  25. 961
  26. 4624
  27. 7921
  28. 1764
  29. 1936
  30. 9216
  31. 1849
  32. 7569
  33. 1444
  34. 3969
  35. 4356
  36. 3364
  37. 2209
  38. 2704
  39. 5041
  40. 8649

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