← 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 396 · 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. 1.74² =
  2. 2.68² =
  3. 3.41² =
  4. 4.62² =
  5. 5.95² =
  6. 6.63² =
  7. 7.42² =
  8. 8.71² =
  9. 9.76² =
  10. 10.72² =
  11. 11.77² =
  12. 12.89² =
  13. 13.69² =
  14. 14.97² =
  15. 15.53² =
  16. 16.46² =
  17. 17.36² =
  18. 18.61² =
  19. 19.45² =
  20. 20.91² =
  21. 21.99² =
  22. 22.81² =
  23. 23.86² =
  24. 24.82² =
  25. 25.96² =
  26. 26.32² =
  27. 27.85² =
  28. 28.98² =
  29. 29.51² =
  30. 30.66² =
  31. 31.65² =
  32. 32.31² =
  33. 33.57² =
  34. 34.47² =
  35. 35.49² =
  36. 36.88² =
  37. 37.73² =
  38. 38.48² =
  39. 39.79² =
  40. 40.67² =

Answer key

  1. 5476
  2. 4624
  3. 1681
  4. 3844
  5. 9025
  6. 3969
  7. 1764
  8. 5041
  9. 5776
  10. 5184
  11. 5929
  12. 7921
  13. 4761
  14. 9409
  15. 2809
  16. 2116
  17. 1296
  18. 3721
  19. 2025
  20. 8281
  21. 9801
  22. 6561
  23. 7396
  24. 6724
  25. 9216
  26. 1024
  27. 7225
  28. 9604
  29. 2601
  30. 4356
  31. 4225
  32. 961
  33. 3249
  34. 2209
  35. 2401
  36. 7744
  37. 5329
  38. 2304
  39. 6241
  40. 4489

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