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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 652 · 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. 1.59² =
  2. 2.76² =
  3. 3.33² =
  4. 4.89² =
  5. 5.56² =
  6. 6.35² =
  7. 7.87² =
  8. 8.93² =
  9. 9.99² =
  10. 10.34² =
  11. 11.86² =
  12. 12.84² =
  13. 13.51² =
  14. 14.61² =
  15. 15.81² =
  16. 16.72² =
  17. 17.38² =
  18. 18.64² =
  19. 19.91² =
  20. 20.52² =
  21. 21.44² =
  22. 22.69² =
  23. 23.78² =
  24. 24.92² =
  25. 25.41² =
  26. 26.47² =
  27. 27.85² =
  28. 28.48² =
  29. 29.54² =
  30. 30.75² =
  31. 31.46² =
  32. 32.42² =
  33. 33.37² =
  34. 34.39² =
  35. 35.62² =
  36. 36.77² =
  37. 37.95² =
  38. 38.98² =
  39. 39.43² =
  40. 40.96² =

Answer key

  1. 3481
  2. 5776
  3. 1089
  4. 7921
  5. 3136
  6. 1225
  7. 7569
  8. 8649
  9. 9801
  10. 1156
  11. 7396
  12. 7056
  13. 2601
  14. 3721
  15. 6561
  16. 5184
  17. 1444
  18. 4096
  19. 8281
  20. 2704
  21. 1936
  22. 4761
  23. 6084
  24. 8464
  25. 1681
  26. 2209
  27. 7225
  28. 2304
  29. 2916
  30. 5625
  31. 2116
  32. 1764
  33. 1369
  34. 1521
  35. 3844
  36. 5929
  37. 9025
  38. 9604
  39. 1849
  40. 9216

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