← 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 974 · 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. 1.51² =
  2. 2.91² =
  3. 3.99² =
  4. 4.43² =
  5. 5.47² =
  6. 6.85² =
  7. 7.39² =
  8. 8.65² =
  9. 9.77² =
  10. 10.46² =
  11. 11.81² =
  12. 12.53² =
  13. 13.88² =
  14. 14.94² =
  15. 15.36² =
  16. 16.83² =
  17. 17.72² =
  18. 18.75² =
  19. 19.69² =
  20. 20.41² =
  21. 21.79² =
  22. 22.57² =
  23. 23.45² =
  24. 24.67² =
  25. 25.82² =
  26. 26.49² =
  27. 27.52² =
  28. 28.61² =
  29. 29.33² =
  30. 30.96² =
  31. 31.37² =
  32. 32.59² =
  33. 33.64² =
  34. 34.74² =
  35. 35.76² =
  36. 36.87² =
  37. 37.44² =
  38. 38.71² =
  39. 39.84² =
  40. 40.92² =

Answer key

  1. 2601
  2. 8281
  3. 9801
  4. 1849
  5. 2209
  6. 7225
  7. 1521
  8. 4225
  9. 5929
  10. 2116
  11. 6561
  12. 2809
  13. 7744
  14. 8836
  15. 1296
  16. 6889
  17. 5184
  18. 5625
  19. 4761
  20. 1681
  21. 6241
  22. 3249
  23. 2025
  24. 4489
  25. 6724
  26. 2401
  27. 2704
  28. 3721
  29. 1089
  30. 9216
  31. 1369
  32. 3481
  33. 4096
  34. 5476
  35. 5776
  36. 7569
  37. 1936
  38. 5041
  39. 7056
  40. 8464

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