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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 797 · 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. 1.92² =
  2. 2.72² =
  3. 3.78² =
  4. 4.94² =
  5. 5.89² =
  6. 6.47² =
  7. 7.93² =
  8. 8.44² =
  9. 9.36² =
  10. 10.53² =
  11. 11.49² =
  12. 12.82² =
  13. 13.33² =
  14. 14.68² =
  15. 15.98² =
  16. 16.79² =
  17. 17.77² =
  18. 18.87² =
  19. 19.35² =
  20. 20.67² =
  21. 21.85² =
  22. 22.39² =
  23. 23.64² =
  24. 24.58² =
  25. 25.76² =
  26. 26.74² =
  27. 27.41² =
  28. 28.48² =
  29. 29.52² =
  30. 30.96² =
  31. 31.61² =
  32. 32.75² =
  33. 33.51² =
  34. 34.91² =
  35. 35.81² =
  36. 36.69² =
  37. 37.59² =
  38. 38.65² =
  39. 39.63² =
  40. 40.38² =

Answer key

  1. 8464
  2. 5184
  3. 6084
  4. 8836
  5. 7921
  6. 2209
  7. 8649
  8. 1936
  9. 1296
  10. 2809
  11. 2401
  12. 6724
  13. 1089
  14. 4624
  15. 9604
  16. 6241
  17. 5929
  18. 7569
  19. 1225
  20. 4489
  21. 7225
  22. 1521
  23. 4096
  24. 3364
  25. 5776
  26. 5476
  27. 1681
  28. 2304
  29. 2704
  30. 9216
  31. 3721
  32. 5625
  33. 2601
  34. 8281
  35. 6561
  36. 4761
  37. 3481
  38. 4225
  39. 3969
  40. 1444

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