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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 337 · 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. 1.54² =
  2. 2.33² =
  3. 3.38² =
  4. 4.82² =
  5. 5.93² =
  6. 6.49² =
  7. 7.81² =
  8. 8.63² =
  9. 9.48² =
  10. 10.66² =
  11. 11.42² =
  12. 12.41² =
  13. 13.51² =
  14. 14.91² =
  15. 15.85² =
  16. 16.52² =
  17. 17.34² =
  18. 18.62² =
  19. 19.46² =
  20. 20.47² =
  21. 21.92² =
  22. 22.43² =
  23. 23.65² =
  24. 24.74² =
  25. 25.55² =
  26. 26.79² =
  27. 27.44² =
  28. 28.56² =
  29. 29.68² =
  30. 30.35² =
  31. 31.99² =
  32. 32.32² =
  33. 33.78² =
  34. 34.71² =
  35. 35.64² =
  36. 36.86² =
  37. 37.59² =
  38. 38.77² =
  39. 39.72² =
  40. 40.89² =

Answer key

  1. 2916
  2. 1089
  3. 1444
  4. 6724
  5. 8649
  6. 2401
  7. 6561
  8. 3969
  9. 2304
  10. 4356
  11. 1764
  12. 1681
  13. 2601
  14. 8281
  15. 7225
  16. 2704
  17. 1156
  18. 3844
  19. 2116
  20. 2209
  21. 8464
  22. 1849
  23. 4225
  24. 5476
  25. 3025
  26. 6241
  27. 1936
  28. 3136
  29. 4624
  30. 1225
  31. 9801
  32. 1024
  33. 6084
  34. 5041
  35. 4096
  36. 7396
  37. 3481
  38. 5929
  39. 5184
  40. 7921

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