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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 192 · 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. 1.76² =
  2. 2.93² =
  3. 3.39² =
  4. 4.34² =
  5. 5.71² =
  6. 6.61² =
  7. 7.94² =
  8. 8.46² =
  9. 9.35² =
  10. 10.48² =
  11. 11.86² =
  12. 12.52² =
  13. 13.78² =
  14. 14.85² =
  15. 15.38² =
  16. 16.81² =
  17. 17.62² =
  18. 18.41² =
  19. 19.49² =
  20. 20.92² =
  21. 21.69² =
  22. 22.96² =
  23. 23.36² =
  24. 24.84² =
  25. 25.51² =
  26. 26.73² =
  27. 27.97² =
  28. 28.53² =
  29. 29.91² =
  30. 30.47² =
  31. 31.55² =
  32. 32.43² =
  33. 33.98² =
  34. 34.32² =
  35. 35.82² =
  36. 36.65² =
  37. 37.67² =
  38. 38.57² =
  39. 39.99² =
  40. 40.77² =

Answer key

  1. 5776
  2. 8649
  3. 1521
  4. 1156
  5. 5041
  6. 3721
  7. 8836
  8. 2116
  9. 1225
  10. 2304
  11. 7396
  12. 2704
  13. 6084
  14. 7225
  15. 1444
  16. 6561
  17. 3844
  18. 1681
  19. 2401
  20. 8464
  21. 4761
  22. 9216
  23. 1296
  24. 7056
  25. 2601
  26. 5329
  27. 9409
  28. 2809
  29. 8281
  30. 2209
  31. 3025
  32. 1849
  33. 9604
  34. 1024
  35. 6724
  36. 4225
  37. 4489
  38. 3249
  39. 9801
  40. 5929

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