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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 772 · 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. 1.56² =
  2. 2.99² =
  3. 3.88² =
  4. 4.61² =
  5. 5.52² =
  6. 6.42² =
  7. 7.36² =
  8. 8.41² =
  9. 9.37² =
  10. 10.72² =
  11. 11.98² =
  12. 12.74² =
  13. 13.82² =
  14. 14.91² =
  15. 15.95² =
  16. 16.47² =
  17. 17.51² =
  18. 18.81² =
  19. 19.62² =
  20. 20.77² =
  21. 21.87² =
  22. 22.58² =
  23. 23.33² =
  24. 24.94² =
  25. 25.48² =
  26. 26.35² =
  27. 27.54² =
  28. 28.57² =
  29. 29.65² =
  30. 30.83² =
  31. 31.69² =
  32. 32.78² =
  33. 33.97² =
  34. 34.45² =
  35. 35.71² =
  36. 36.75² =
  37. 37.86² =
  38. 38.53² =
  39. 39.84² =
  40. 40.96² =

Answer key

  1. 3136
  2. 9801
  3. 7744
  4. 3721
  5. 2704
  6. 1764
  7. 1296
  8. 1681
  9. 1369
  10. 5184
  11. 9604
  12. 5476
  13. 6724
  14. 8281
  15. 9025
  16. 2209
  17. 2601
  18. 6561
  19. 3844
  20. 5929
  21. 7569
  22. 3364
  23. 1089
  24. 8836
  25. 2304
  26. 1225
  27. 2916
  28. 3249
  29. 4225
  30. 6889
  31. 4761
  32. 6084
  33. 9409
  34. 2025
  35. 5041
  36. 5625
  37. 7396
  38. 2809
  39. 7056
  40. 9216

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