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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 552 · 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. 1.44² =
  2. 2.74² =
  3. 3.82² =
  4. 4.61² =
  5. 5.37² =
  6. 6.95² =
  7. 7.89² =
  8. 8.68² =
  9. 9.88² =
  10. 10.79² =
  11. 11.91² =
  12. 12.31² =
  13. 13.45² =
  14. 14.54² =
  15. 15.84² =
  16. 16.57² =
  17. 17.41² =
  18. 18.36² =
  19. 19.96² =
  20. 20.64² =
  21. 21.51² =
  22. 22.35² =
  23. 23.97² =
  24. 24.49² =
  25. 25.32² =
  26. 26.62² =
  27. 27.42² =
  28. 28.72² =
  29. 29.52² =
  30. 30.78² =
  31. 31.59² =
  32. 32.34² =
  33. 33.53² =
  34. 34.94² =
  35. 35.43² =
  36. 36.76² =
  37. 37.81² =
  38. 38.99² =
  39. 39.39² =
  40. 40.48² =

Answer key

  1. 1936
  2. 5476
  3. 6724
  4. 3721
  5. 1369
  6. 9025
  7. 7921
  8. 4624
  9. 7744
  10. 6241
  11. 8281
  12. 961
  13. 2025
  14. 2916
  15. 7056
  16. 3249
  17. 1681
  18. 1296
  19. 9216
  20. 4096
  21. 2601
  22. 1225
  23. 9409
  24. 2401
  25. 1024
  26. 3844
  27. 1764
  28. 5184
  29. 2704
  30. 6084
  31. 3481
  32. 1156
  33. 2809
  34. 8836
  35. 1849
  36. 5776
  37. 6561
  38. 9801
  39. 1521
  40. 2304

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