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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 643 · 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. 1.46² =
  2. 2.74² =
  3. 3.78² =
  4. 4.51² =
  5. 5.83² =
  6. 6.91² =
  7. 7.71² =
  8. 8.43² =
  9. 9.64² =
  10. 10.68² =
  11. 11.39² =
  12. 12.88² =
  13. 13.99² =
  14. 14.61² =
  15. 15.84² =
  16. 16.45² =
  17. 17.76² =
  18. 18.98² =
  19. 19.54² =
  20. 20.65² =
  21. 21.67² =
  22. 22.42² =
  23. 23.95² =
  24. 24.69² =
  25. 25.41² =
  26. 26.63² =
  27. 27.72² =
  28. 28.87² =
  29. 29.58² =
  30. 30.47² =
  31. 31.89² =
  32. 32.34² =
  33. 33.82² =
  34. 34.59² =
  35. 35.38² =
  36. 36.36² =
  37. 37.92² =
  38. 38.56² =
  39. 39.35² =
  40. 40.33² =

Answer key

  1. 2116
  2. 5476
  3. 6084
  4. 2601
  5. 6889
  6. 8281
  7. 5041
  8. 1849
  9. 4096
  10. 4624
  11. 1521
  12. 7744
  13. 9801
  14. 3721
  15. 7056
  16. 2025
  17. 5776
  18. 9604
  19. 2916
  20. 4225
  21. 4489
  22. 1764
  23. 9025
  24. 4761
  25. 1681
  26. 3969
  27. 5184
  28. 7569
  29. 3364
  30. 2209
  31. 7921
  32. 1156
  33. 6724
  34. 3481
  35. 1444
  36. 1296
  37. 8464
  38. 3136
  39. 1225
  40. 1089

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