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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 790 · 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. 1.88² =
  2. 2.95² =
  3. 3.34² =
  4. 4.84² =
  5. 5.65² =
  6. 6.81² =
  7. 7.43² =
  8. 8.38² =
  9. 9.68² =
  10. 10.39² =
  11. 11.51² =
  12. 12.62² =
  13. 13.58² =
  14. 14.89² =
  15. 15.33² =
  16. 16.69² =
  17. 17.35² =
  18. 18.61² =
  19. 19.72² =
  20. 20.41² =
  21. 21.75² =
  22. 22.57² =
  23. 23.85² =
  24. 24.46² =
  25. 25.66² =
  26. 26.98² =
  27. 27.52² =
  28. 28.87² =
  29. 29.63² =
  30. 30.77² =
  31. 31.54² =
  32. 32.49² =
  33. 33.71² =
  34. 34.48² =
  35. 35.59² =
  36. 36.32² =
  37. 37.96² =
  38. 38.31² =
  39. 39.56² =
  40. 40.92² =

Answer key

  1. 7744
  2. 9025
  3. 1156
  4. 7056
  5. 4225
  6. 6561
  7. 1849
  8. 1444
  9. 4624
  10. 1521
  11. 2601
  12. 3844
  13. 3364
  14. 7921
  15. 1089
  16. 4761
  17. 1225
  18. 3721
  19. 5184
  20. 1681
  21. 5625
  22. 3249
  23. 7225
  24. 2116
  25. 4356
  26. 9604
  27. 2704
  28. 7569
  29. 3969
  30. 5929
  31. 2916
  32. 2401
  33. 5041
  34. 2304
  35. 3481
  36. 1024
  37. 9216
  38. 961
  39. 3136
  40. 8464

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