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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 310 · 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. 2.45² =
  3. 3.37² =
  4. 4.69² =
  5. 5.47² =
  6. 6.64² =
  7. 7.34² =
  8. 8.95² =
  9. 9.62² =
  10. 10.68² =
  11. 11.53² =
  12. 12.43² =
  13. 13.97² =
  14. 14.91² =
  15. 15.67² =
  16. 16.61² =
  17. 17.84² =
  18. 18.48² =
  19. 19.78² =
  20. 20.59² =
  21. 21.52² =
  22. 22.73² =
  23. 23.36² =
  24. 24.41² =
  25. 25.32² =
  26. 26.58² =
  27. 27.72² =
  28. 28.39² =
  29. 29.44² =
  30. 30.42² =
  31. 31.87² =
  32. 32.71² =
  33. 33.65² =
  34. 34.57² =
  35. 35.83² =
  36. 36.96² =
  37. 37.77² =
  38. 38.94² =
  39. 39.79² =
  40. 40.74² =

Answer key

  1. 7225
  2. 2025
  3. 1369
  4. 4761
  5. 2209
  6. 4096
  7. 1156
  8. 9025
  9. 3844
  10. 4624
  11. 2809
  12. 1849
  13. 9409
  14. 8281
  15. 4489
  16. 3721
  17. 7056
  18. 2304
  19. 6084
  20. 3481
  21. 2704
  22. 5329
  23. 1296
  24. 1681
  25. 1024
  26. 3364
  27. 5184
  28. 1521
  29. 1936
  30. 1764
  31. 7569
  32. 5041
  33. 4225
  34. 3249
  35. 6889
  36. 9216
  37. 5929
  38. 8836
  39. 6241
  40. 5476

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