← 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 350 · 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. 1.82² =
  2. 2.95² =
  3. 3.79² =
  4. 4.71² =
  5. 5.78² =
  6. 6.47² =
  7. 7.51² =
  8. 8.97² =
  9. 9.63² =
  10. 10.36² =
  11. 11.48² =
  12. 12.91² =
  13. 13.61² =
  14. 14.66² =
  15. 15.64² =
  16. 16.39² =
  17. 17.75² =
  18. 18.37² =
  19. 19.38² =
  20. 20.77² =
  21. 21.99² =
  22. 22.81² =
  23. 23.45² =
  24. 24.72² =
  25. 25.94² =
  26. 26.67² =
  27. 27.58² =
  28. 28.84² =
  29. 29.34² =
  30. 30.43² =
  31. 31.69² =
  32. 32.68² =
  33. 33.59² =
  34. 34.62² =
  35. 35.98² =
  36. 36.33² =
  37. 37.55² =
  38. 38.88² =
  39. 39.57² =
  40. 40.31² =

Answer key

  1. 6724
  2. 9025
  3. 6241
  4. 5041
  5. 6084
  6. 2209
  7. 2601
  8. 9409
  9. 3969
  10. 1296
  11. 2304
  12. 8281
  13. 3721
  14. 4356
  15. 4096
  16. 1521
  17. 5625
  18. 1369
  19. 1444
  20. 5929
  21. 9801
  22. 6561
  23. 2025
  24. 5184
  25. 8836
  26. 4489
  27. 3364
  28. 7056
  29. 1156
  30. 1849
  31. 4761
  32. 4624
  33. 3481
  34. 3844
  35. 9604
  36. 1089
  37. 3025
  38. 7744
  39. 3249
  40. 961

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