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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 799 · 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. 1.91² =
  2. 2.52² =
  3. 3.97² =
  4. 4.38² =
  5. 5.95² =
  6. 6.56² =
  7. 7.41² =
  8. 8.44² =
  9. 9.73² =
  10. 10.63² =
  11. 11.74² =
  12. 12.61² =
  13. 13.79² =
  14. 14.72² =
  15. 15.34² =
  16. 16.62² =
  17. 17.85² =
  18. 18.35² =
  19. 19.71² =
  20. 20.84² =
  21. 21.51² =
  22. 22.37² =
  23. 23.65² =
  24. 24.69² =
  25. 25.81² =
  26. 26.47² =
  27. 27.66² =
  28. 28.31² =
  29. 29.39² =
  30. 30.93² =
  31. 31.53² =
  32. 32.92² =
  33. 33.88² =
  34. 34.48² =
  35. 35.86² =
  36. 36.36² =
  37. 37.45² =
  38. 38.43² =
  39. 39.99² =
  40. 40.75² =

Answer key

  1. 8281
  2. 2704
  3. 9409
  4. 1444
  5. 9025
  6. 3136
  7. 1681
  8. 1936
  9. 5329
  10. 3969
  11. 5476
  12. 3721
  13. 6241
  14. 5184
  15. 1156
  16. 3844
  17. 7225
  18. 1225
  19. 5041
  20. 7056
  21. 2601
  22. 1369
  23. 4225
  24. 4761
  25. 6561
  26. 2209
  27. 4356
  28. 961
  29. 1521
  30. 8649
  31. 2809
  32. 8464
  33. 7744
  34. 2304
  35. 7396
  36. 1296
  37. 2025
  38. 1849
  39. 9801
  40. 5625

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