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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 73 · 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. 2.32² =
  3. 3.52² =
  4. 4.59² =
  5. 5.41² =
  6. 6.81² =
  7. 7.38² =
  8. 8.33² =
  9. 9.78² =
  10. 10.39² =
  11. 11.68² =
  12. 12.61² =
  13. 13.34² =
  14. 14.98² =
  15. 15.47² =
  16. 16.63² =
  17. 17.53² =
  18. 18.56² =
  19. 19.72² =
  20. 20.97² =
  21. 21.43² =
  22. 22.48² =
  23. 23.84² =
  24. 24.99² =
  25. 25.75² =
  26. 26.54² =
  27. 27.65² =
  28. 28.95² =
  29. 29.89² =
  30. 30.58² =
  31. 31.36² =
  32. 32.49² =
  33. 33.35² =
  34. 34.85² =
  35. 35.66² =
  36. 36.86² =
  37. 37.71² =
  38. 38.69² =
  39. 39.76² =
  40. 40.42² =

Answer key

  1. 8464
  2. 1024
  3. 2704
  4. 3481
  5. 1681
  6. 6561
  7. 1444
  8. 1089
  9. 6084
  10. 1521
  11. 4624
  12. 3721
  13. 1156
  14. 9604
  15. 2209
  16. 3969
  17. 2809
  18. 3136
  19. 5184
  20. 9409
  21. 1849
  22. 2304
  23. 7056
  24. 9801
  25. 5625
  26. 2916
  27. 4225
  28. 9025
  29. 7921
  30. 3364
  31. 1296
  32. 2401
  33. 1225
  34. 7225
  35. 4356
  36. 7396
  37. 5041
  38. 4761
  39. 5776
  40. 1764

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