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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 26 · 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. 1.86² =
  2. 2.91² =
  3. 3.64² =
  4. 4.49² =
  5. 5.59² =
  6. 6.79² =
  7. 7.68² =
  8. 8.31² =
  9. 9.76² =
  10. 10.95² =
  11. 11.93² =
  12. 12.82² =
  13. 13.55² =
  14. 14.87² =
  15. 15.89² =
  16. 16.46² =
  17. 17.71² =
  18. 18.35² =
  19. 19.43² =
  20. 20.48² =
  21. 21.97² =
  22. 22.81² =
  23. 23.51² =
  24. 24.52² =
  25. 25.74² =
  26. 26.36² =
  27. 27.41² =
  28. 28.61² =
  29. 29.96² =
  30. 30.47² =
  31. 31.62² =
  32. 32.94² =
  33. 33.45² =
  34. 34.32² =
  35. 35.84² =
  36. 36.88² =
  37. 37.34² =
  38. 38.39² =
  39. 39.72² =
  40. 40.54² =

Answer key

  1. 7396
  2. 8281
  3. 4096
  4. 2401
  5. 3481
  6. 6241
  7. 4624
  8. 961
  9. 5776
  10. 9025
  11. 8649
  12. 6724
  13. 3025
  14. 7569
  15. 7921
  16. 2116
  17. 5041
  18. 1225
  19. 1849
  20. 2304
  21. 9409
  22. 6561
  23. 2601
  24. 2704
  25. 5476
  26. 1296
  27. 1681
  28. 3721
  29. 9216
  30. 2209
  31. 3844
  32. 8836
  33. 2025
  34. 1024
  35. 7056
  36. 7744
  37. 1156
  38. 1521
  39. 5184
  40. 2916

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