← 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 149 · 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. 1.53² =
  2. 2.46² =
  3. 3.57² =
  4. 4.68² =
  5. 5.33² =
  6. 6.74² =
  7. 7.93² =
  8. 8.56² =
  9. 9.95² =
  10. 10.58² =
  11. 11.59² =
  12. 12.97² =
  13. 13.65² =
  14. 14.84² =
  15. 15.72² =
  16. 16.66² =
  17. 17.52² =
  18. 18.51² =
  19. 19.49² =
  20. 20.89² =
  21. 21.34² =
  22. 22.36² =
  23. 23.77² =
  24. 24.39² =
  25. 25.61² =
  26. 26.67² =
  27. 27.79² =
  28. 28.85² =
  29. 29.71² =
  30. 30.43² =
  31. 31.76² =
  32. 32.32² =
  33. 33.48² =
  34. 34.41² =
  35. 35.78² =
  36. 36.98² =
  37. 37.35² =
  38. 38.54² =
  39. 39.91² =
  40. 40.92² =

Answer key

  1. 2809
  2. 2116
  3. 3249
  4. 4624
  5. 1089
  6. 5476
  7. 8649
  8. 3136
  9. 9025
  10. 3364
  11. 3481
  12. 9409
  13. 4225
  14. 7056
  15. 5184
  16. 4356
  17. 2704
  18. 2601
  19. 2401
  20. 7921
  21. 1156
  22. 1296
  23. 5929
  24. 1521
  25. 3721
  26. 4489
  27. 6241
  28. 7225
  29. 5041
  30. 1849
  31. 5776
  32. 1024
  33. 2304
  34. 1681
  35. 6084
  36. 9604
  37. 1225
  38. 2916
  39. 8281
  40. 8464

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