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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 667 · 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. 1.38² =
  2. 2.45² =
  3. 3.98² =
  4. 4.47² =
  5. 5.76² =
  6. 6.87² =
  7. 7.83² =
  8. 8.63² =
  9. 9.51² =
  10. 10.49² =
  11. 11.68² =
  12. 12.79² =
  13. 13.37² =
  14. 14.57² =
  15. 15.67² =
  16. 16.92² =
  17. 17.34² =
  18. 18.86² =
  19. 19.91² =
  20. 20.59² =
  21. 21.62² =
  22. 22.39² =
  23. 23.42² =
  24. 24.74² =
  25. 25.77² =
  26. 26.72² =
  27. 27.31² =
  28. 28.89² =
  29. 29.44² =
  30. 30.69² =
  31. 31.99² =
  32. 32.61² =
  33. 33.85² =
  34. 34.71² =
  35. 35.84² =
  36. 36.78² =
  37. 37.41² =
  38. 38.96² =
  39. 39.32² =
  40. 40.64² =

Answer key

  1. 1444
  2. 2025
  3. 9604
  4. 2209
  5. 5776
  6. 7569
  7. 6889
  8. 3969
  9. 2601
  10. 2401
  11. 4624
  12. 6241
  13. 1369
  14. 3249
  15. 4489
  16. 8464
  17. 1156
  18. 7396
  19. 8281
  20. 3481
  21. 3844
  22. 1521
  23. 1764
  24. 5476
  25. 5929
  26. 5184
  27. 961
  28. 7921
  29. 1936
  30. 4761
  31. 9801
  32. 3721
  33. 7225
  34. 5041
  35. 7056
  36. 6084
  37. 1681
  38. 9216
  39. 1024
  40. 4096

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