← 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 619 · 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. 1.68² =
  2. 2.41² =
  3. 3.52² =
  4. 4.31² =
  5. 5.51² =
  6. 6.91² =
  7. 7.71² =
  8. 8.73² =
  9. 9.89² =
  10. 10.38² =
  11. 11.63² =
  12. 12.61² =
  13. 13.92² =
  14. 14.74² =
  15. 15.34² =
  16. 16.75² =
  17. 17.35² =
  18. 18.66² =
  19. 19.59² =
  20. 20.94² =
  21. 21.62² =
  22. 22.79² =
  23. 23.53² =
  24. 24.67² =
  25. 25.49² =
  26. 26.46² =
  27. 27.83² =
  28. 28.99² =
  29. 29.54² =
  30. 30.98² =
  31. 31.39² =
  32. 32.96² =
  33. 33.72² =
  34. 34.47² =
  35. 35.33² =
  36. 36.81² =
  37. 37.85² =
  38. 38.84² =
  39. 39.86² =
  40. 40.82² =

Answer key

  1. 4624
  2. 1681
  3. 2704
  4. 961
  5. 2601
  6. 8281
  7. 5041
  8. 5329
  9. 7921
  10. 1444
  11. 3969
  12. 3721
  13. 8464
  14. 5476
  15. 1156
  16. 5625
  17. 1225
  18. 4356
  19. 3481
  20. 8836
  21. 3844
  22. 6241
  23. 2809
  24. 4489
  25. 2401
  26. 2116
  27. 6889
  28. 9801
  29. 2916
  30. 9604
  31. 1521
  32. 9216
  33. 5184
  34. 2209
  35. 1089
  36. 6561
  37. 7225
  38. 7056
  39. 7396
  40. 6724

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