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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 351 · 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. 2.52² =
  3. 3.51² =
  4. 4.62² =
  5. 5.34² =
  6. 6.81² =
  7. 7.31² =
  8. 8.36² =
  9. 9.85² =
  10. 10.91² =
  11. 11.53² =
  12. 12.71² =
  13. 13.59² =
  14. 14.35² =
  15. 15.87² =
  16. 16.33² =
  17. 17.47² =
  18. 18.46² =
  19. 19.38² =
  20. 20.55² =
  21. 21.39² =
  22. 22.54² =
  23. 23.72² =
  24. 24.61² =
  25. 25.42² =
  26. 26.49² =
  27. 27.57² =
  28. 28.65² =
  29. 29.48² =
  30. 30.95² =
  31. 31.43² =
  32. 32.98² =
  33. 33.78² =
  34. 34.41² =
  35. 35.84² =
  36. 36.97² =
  37. 37.82² =
  38. 38.37² =
  39. 39.89² =
  40. 40.88² =

Answer key

  1. 8464
  2. 2704
  3. 2601
  4. 3844
  5. 1156
  6. 6561
  7. 961
  8. 1296
  9. 7225
  10. 8281
  11. 2809
  12. 5041
  13. 3481
  14. 1225
  15. 7569
  16. 1089
  17. 2209
  18. 2116
  19. 1444
  20. 3025
  21. 1521
  22. 2916
  23. 5184
  24. 3721
  25. 1764
  26. 2401
  27. 3249
  28. 4225
  29. 2304
  30. 9025
  31. 1849
  32. 9604
  33. 6084
  34. 1681
  35. 7056
  36. 9409
  37. 6724
  38. 1369
  39. 7921
  40. 7744

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