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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 139 · 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. 1.61² =
  2. 2.78² =
  3. 3.32² =
  4. 4.87² =
  5. 5.42² =
  6. 6.99² =
  7. 7.46² =
  8. 8.34² =
  9. 9.48² =
  10. 10.47² =
  11. 11.75² =
  12. 12.51² =
  13. 13.94² =
  14. 14.96² =
  15. 15.67² =
  16. 16.91² =
  17. 17.86² =
  18. 18.73² =
  19. 19.89² =
  20. 20.43² =
  21. 21.74² =
  22. 22.98² =
  23. 23.56² =
  24. 24.71² =
  25. 25.97² =
  26. 26.35² =
  27. 27.68² =
  28. 28.64² =
  29. 29.79² =
  30. 30.82² =
  31. 31.44² =
  32. 32.59² =
  33. 33.81² =
  34. 34.37² =
  35. 35.41² =
  36. 36.65² =
  37. 37.53² =
  38. 38.54² =
  39. 39.52² =
  40. 40.63² =

Answer key

  1. 3721
  2. 6084
  3. 1024
  4. 7569
  5. 1764
  6. 9801
  7. 2116
  8. 1156
  9. 2304
  10. 2209
  11. 5625
  12. 2601
  13. 8836
  14. 9216
  15. 4489
  16. 8281
  17. 7396
  18. 5329
  19. 7921
  20. 1849
  21. 5476
  22. 9604
  23. 3136
  24. 5041
  25. 9409
  26. 1225
  27. 4624
  28. 4096
  29. 6241
  30. 6724
  31. 1936
  32. 3481
  33. 6561
  34. 1369
  35. 1681
  36. 4225
  37. 2809
  38. 2916
  39. 2704
  40. 3969

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