← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 802 · 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. 1.47² =
  2. 2.69² =
  3. 3.34² =
  4. 4.39² =
  5. 5.62² =
  6. 6.31² =
  7. 7.96² =
  8. 8.51² =
  9. 9.35² =
  10. 10.42² =
  11. 11.54² =
  12. 12.94² =
  13. 13.76² =
  14. 14.66² =
  15. 15.43² =
  16. 16.44² =
  17. 17.48² =
  18. 18.91² =
  19. 19.71² =
  20. 20.46² =
  21. 21.45² =
  22. 22.37² =
  23. 23.86² =
  24. 24.97² =
  25. 25.82² =
  26. 26.85² =
  27. 27.89² =
  28. 28.93² =
  29. 29.88² =
  30. 30.84² =
  31. 31.59² =
  32. 32.64² =
  33. 33.67² =
  34. 34.77² =
  35. 35.32² =
  36. 36.57² =
  37. 37.49² =
  38. 38.81² =
  39. 39.95² =
  40. 40.92² =

Answer key

  1. 2209
  2. 4761
  3. 1156
  4. 1521
  5. 3844
  6. 961
  7. 9216
  8. 2601
  9. 1225
  10. 1764
  11. 2916
  12. 8836
  13. 5776
  14. 4356
  15. 1849
  16. 1936
  17. 2304
  18. 8281
  19. 5041
  20. 2116
  21. 2025
  22. 1369
  23. 7396
  24. 9409
  25. 6724
  26. 7225
  27. 7921
  28. 8649
  29. 7744
  30. 7056
  31. 3481
  32. 4096
  33. 4489
  34. 5929
  35. 1024
  36. 3249
  37. 2401
  38. 6561
  39. 9025
  40. 8464

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths