← 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 910 · 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. 2.81² =
  3. 3.44² =
  4. 4.82² =
  5. 5.66² =
  6. 6.48² =
  7. 7.76² =
  8. 8.63² =
  9. 9.46² =
  10. 10.71² =
  11. 11.72² =
  12. 12.45² =
  13. 13.32² =
  14. 14.61² =
  15. 15.92² =
  16. 16.75² =
  17. 17.43² =
  18. 18.54² =
  19. 19.35² =
  20. 20.31² =
  21. 21.93² =
  22. 22.36² =
  23. 23.84² =
  24. 24.51² =
  25. 25.94² =
  26. 26.69² =
  27. 27.62² =
  28. 28.53² =
  29. 29.89² =
  30. 30.33² =
  31. 31.41² =
  32. 32.67² =
  33. 33.88² =
  34. 34.98² =
  35. 35.79² =
  36. 36.86² =
  37. 37.87² =
  38. 38.57² =
  39. 39.52² =
  40. 40.73² =

Answer key

  1. 5476
  2. 6561
  3. 1936
  4. 6724
  5. 4356
  6. 2304
  7. 5776
  8. 3969
  9. 2116
  10. 5041
  11. 5184
  12. 2025
  13. 1024
  14. 3721
  15. 8464
  16. 5625
  17. 1849
  18. 2916
  19. 1225
  20. 961
  21. 8649
  22. 1296
  23. 7056
  24. 2601
  25. 8836
  26. 4761
  27. 3844
  28. 2809
  29. 7921
  30. 1089
  31. 1681
  32. 4489
  33. 7744
  34. 9604
  35. 6241
  36. 7396
  37. 7569
  38. 3249
  39. 2704
  40. 5329

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