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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 24 · 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. 1.36² =
  2. 2.87² =
  3. 3.71² =
  4. 4.53² =
  5. 5.92² =
  6. 6.76² =
  7. 7.78² =
  8. 8.79² =
  9. 9.94² =
  10. 10.91² =
  11. 11.62² =
  12. 12.72² =
  13. 13.39² =
  14. 14.34² =
  15. 15.45² =
  16. 16.35² =
  17. 17.58² =
  18. 18.64² =
  19. 19.48² =
  20. 20.83² =
  21. 21.44² =
  22. 22.98² =
  23. 23.89² =
  24. 24.66² =
  25. 25.33² =
  26. 26.77² =
  27. 27.61² =
  28. 28.93² =
  29. 29.73² =
  30. 30.47² =
  31. 31.95² =
  32. 32.51² =
  33. 33.37² =
  34. 34.85² =
  35. 35.96² =
  36. 36.68² =
  37. 37.38² =
  38. 38.31² =
  39. 39.65² =
  40. 40.86² =

Answer key

  1. 1296
  2. 7569
  3. 5041
  4. 2809
  5. 8464
  6. 5776
  7. 6084
  8. 6241
  9. 8836
  10. 8281
  11. 3844
  12. 5184
  13. 1521
  14. 1156
  15. 2025
  16. 1225
  17. 3364
  18. 4096
  19. 2304
  20. 6889
  21. 1936
  22. 9604
  23. 7921
  24. 4356
  25. 1089
  26. 5929
  27. 3721
  28. 8649
  29. 5329
  30. 2209
  31. 9025
  32. 2601
  33. 1369
  34. 7225
  35. 9216
  36. 4624
  37. 1444
  38. 961
  39. 4225
  40. 7396

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