← 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 918 · 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. 1.71² =
  2. 2.99² =
  3. 3.44² =
  4. 4.52² =
  5. 5.66² =
  6. 6.93² =
  7. 7.94² =
  8. 8.72² =
  9. 9.69² =
  10. 10.47² =
  11. 11.63² =
  12. 12.64² =
  13. 13.58² =
  14. 14.86² =
  15. 15.76² =
  16. 16.37² =
  17. 17.54² =
  18. 18.33² =
  19. 19.51² =
  20. 20.79² =
  21. 21.61² =
  22. 22.41² =
  23. 23.73² =
  24. 24.98² =
  25. 25.67² =
  26. 26.87² =
  27. 27.82² =
  28. 28.83² =
  29. 29.96² =
  30. 30.48² =
  31. 31.85² =
  32. 32.38² =
  33. 33.57² =
  34. 34.31² =
  35. 35.95² =
  36. 36.92² =
  37. 37.46² =
  38. 38.59² =
  39. 39.74² =
  40. 40.56² =

Answer key

  1. 5041
  2. 9801
  3. 1936
  4. 2704
  5. 4356
  6. 8649
  7. 8836
  8. 5184
  9. 4761
  10. 2209
  11. 3969
  12. 4096
  13. 3364
  14. 7396
  15. 5776
  16. 1369
  17. 2916
  18. 1089
  19. 2601
  20. 6241
  21. 3721
  22. 1681
  23. 5329
  24. 9604
  25. 4489
  26. 7569
  27. 6724
  28. 6889
  29. 9216
  30. 2304
  31. 7225
  32. 1444
  33. 3249
  34. 961
  35. 9025
  36. 8464
  37. 2116
  38. 3481
  39. 5476
  40. 3136

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