← 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 445 · 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. 1.66² =
  2. 2.58² =
  3. 3.39² =
  4. 4.91² =
  5. 5.38² =
  6. 6.44² =
  7. 7.65² =
  8. 8.51² =
  9. 9.85² =
  10. 10.55² =
  11. 11.86² =
  12. 12.75² =
  13. 13.78² =
  14. 14.96² =
  15. 15.37² =
  16. 16.47² =
  17. 17.71² =
  18. 18.42² =
  19. 19.52² =
  20. 20.87² =
  21. 21.82² =
  22. 22.34² =
  23. 23.77² =
  24. 24.98² =
  25. 25.69² =
  26. 26.76² =
  27. 27.61² =
  28. 28.31² =
  29. 29.67² =
  30. 30.48² =
  31. 31.33² =
  32. 32.36² =
  33. 33.64² =
  34. 34.45² =
  35. 35.83² =
  36. 36.68² =
  37. 37.97² =
  38. 38.72² =
  39. 39.84² =
  40. 40.54² =

Answer key

  1. 4356
  2. 3364
  3. 1521
  4. 8281
  5. 1444
  6. 1936
  7. 4225
  8. 2601
  9. 7225
  10. 3025
  11. 7396
  12. 5625
  13. 6084
  14. 9216
  15. 1369
  16. 2209
  17. 5041
  18. 1764
  19. 2704
  20. 7569
  21. 6724
  22. 1156
  23. 5929
  24. 9604
  25. 4761
  26. 5776
  27. 3721
  28. 961
  29. 4489
  30. 2304
  31. 1089
  32. 1296
  33. 4096
  34. 2025
  35. 6889
  36. 4624
  37. 9409
  38. 5184
  39. 7056
  40. 2916

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