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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 522 · 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. 1.39² =
  2. 2.92² =
  3. 3.85² =
  4. 4.53² =
  5. 5.81² =
  6. 6.91² =
  7. 7.46² =
  8. 8.78² =
  9. 9.44² =
  10. 10.64² =
  11. 11.98² =
  12. 12.93² =
  13. 13.54² =
  14. 14.88² =
  15. 15.31² =
  16. 16.55² =
  17. 17.94² =
  18. 18.41² =
  19. 19.36² =
  20. 20.62² =
  21. 21.45² =
  22. 22.68² =
  23. 23.67² =
  24. 24.48² =
  25. 25.97² =
  26. 26.83² =
  27. 27.34² =
  28. 28.86² =
  29. 29.52² =
  30. 30.59² =
  31. 31.69² =
  32. 32.82² =
  33. 33.57² =
  34. 34.42² =
  35. 35.79² =
  36. 36.43² =
  37. 37.66² =
  38. 38.51² =
  39. 39.61² =
  40. 40.35² =

Answer key

  1. 1521
  2. 8464
  3. 7225
  4. 2809
  5. 6561
  6. 8281
  7. 2116
  8. 6084
  9. 1936
  10. 4096
  11. 9604
  12. 8649
  13. 2916
  14. 7744
  15. 961
  16. 3025
  17. 8836
  18. 1681
  19. 1296
  20. 3844
  21. 2025
  22. 4624
  23. 4489
  24. 2304
  25. 9409
  26. 6889
  27. 1156
  28. 7396
  29. 2704
  30. 3481
  31. 4761
  32. 6724
  33. 3249
  34. 1764
  35. 6241
  36. 1849
  37. 4356
  38. 2601
  39. 3721
  40. 1225

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