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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 792 · 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. 1.69² =
  2. 2.36² =
  3. 3.94² =
  4. 4.79² =
  5. 5.42² =
  6. 6.52² =
  7. 7.46² =
  8. 8.32² =
  9. 9.91² =
  10. 10.88² =
  11. 11.92² =
  12. 12.35² =
  13. 13.53² =
  14. 14.61² =
  15. 15.98² =
  16. 16.59² =
  17. 17.41² =
  18. 18.62² =
  19. 19.77² =
  20. 20.67² =
  21. 21.84² =
  22. 22.44² =
  23. 23.66² =
  24. 24.83² =
  25. 25.57² =
  26. 26.34² =
  27. 27.49² =
  28. 28.37² =
  29. 29.39² =
  30. 30.47² =
  31. 31.64² =
  32. 32.96² =
  33. 33.54² =
  34. 34.65² =
  35. 35.38² =
  36. 36.71² =
  37. 37.55² =
  38. 38.89² =
  39. 39.97² =
  40. 40.31² =

Answer key

  1. 4761
  2. 1296
  3. 8836
  4. 6241
  5. 1764
  6. 2704
  7. 2116
  8. 1024
  9. 8281
  10. 7744
  11. 8464
  12. 1225
  13. 2809
  14. 3721
  15. 9604
  16. 3481
  17. 1681
  18. 3844
  19. 5929
  20. 4489
  21. 7056
  22. 1936
  23. 4356
  24. 6889
  25. 3249
  26. 1156
  27. 2401
  28. 1369
  29. 1521
  30. 2209
  31. 4096
  32. 9216
  33. 2916
  34. 4225
  35. 1444
  36. 5041
  37. 3025
  38. 7921
  39. 9409
  40. 961

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