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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 592 · 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. 1.65² =
  2. 2.59² =
  3. 3.69² =
  4. 4.89² =
  5. 5.45² =
  6. 6.35² =
  7. 7.96² =
  8. 8.84² =
  9. 9.64² =
  10. 10.66² =
  11. 11.86² =
  12. 12.67² =
  13. 13.42² =
  14. 14.99² =
  15. 15.68² =
  16. 16.44² =
  17. 17.78² =
  18. 18.71² =
  19. 19.41² =
  20. 20.81² =
  21. 21.51² =
  22. 22.52² =
  23. 23.93² =
  24. 24.82² =
  25. 25.91² =
  26. 26.73² =
  27. 27.85² =
  28. 28.38² =
  29. 29.92² =
  30. 30.34² =
  31. 31.36² =
  32. 32.49² =
  33. 33.94² =
  34. 34.56² =
  35. 35.31² =
  36. 36.47² =
  37. 37.74² =
  38. 38.46² =
  39. 39.37² =
  40. 40.79² =

Answer key

  1. 4225
  2. 3481
  3. 4761
  4. 7921
  5. 2025
  6. 1225
  7. 9216
  8. 7056
  9. 4096
  10. 4356
  11. 7396
  12. 4489
  13. 1764
  14. 9801
  15. 4624
  16. 1936
  17. 6084
  18. 5041
  19. 1681
  20. 6561
  21. 2601
  22. 2704
  23. 8649
  24. 6724
  25. 8281
  26. 5329
  27. 7225
  28. 1444
  29. 8464
  30. 1156
  31. 1296
  32. 2401
  33. 8836
  34. 3136
  35. 961
  36. 2209
  37. 5476
  38. 2116
  39. 1369
  40. 6241

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