← 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 212 · 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. 1.41² =
  2. 2.52² =
  3. 3.99² =
  4. 4.48² =
  5. 5.62² =
  6. 6.45² =
  7. 7.84² =
  8. 8.47² =
  9. 9.87² =
  10. 10.36² =
  11. 11.81² =
  12. 12.31² =
  13. 13.54² =
  14. 14.33² =
  15. 15.71² =
  16. 16.96² =
  17. 17.37² =
  18. 18.65² =
  19. 19.77² =
  20. 20.61² =
  21. 21.63² =
  22. 22.55² =
  23. 23.46² =
  24. 24.69² =
  25. 25.59² =
  26. 26.82² =
  27. 27.79² =
  28. 28.89² =
  29. 29.72² =
  30. 30.51² =
  31. 31.49² =
  32. 32.74² =
  33. 33.93² =
  34. 34.38² =
  35. 35.35² =
  36. 36.66² =
  37. 37.32² =
  38. 38.57² =
  39. 39.44² =
  40. 40.75² =

Answer key

  1. 1681
  2. 2704
  3. 9801
  4. 2304
  5. 3844
  6. 2025
  7. 7056
  8. 2209
  9. 7569
  10. 1296
  11. 6561
  12. 961
  13. 2916
  14. 1089
  15. 5041
  16. 9216
  17. 1369
  18. 4225
  19. 5929
  20. 3721
  21. 3969
  22. 3025
  23. 2116
  24. 4761
  25. 3481
  26. 6724
  27. 6241
  28. 7921
  29. 5184
  30. 2601
  31. 2401
  32. 5476
  33. 8649
  34. 1444
  35. 1225
  36. 4356
  37. 1024
  38. 3249
  39. 1936
  40. 5625

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