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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 64 · 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. 1.98² =
  2. 2.68² =
  3. 3.43² =
  4. 4.51² =
  5. 5.34² =
  6. 6.39² =
  7. 7.94² =
  8. 8.95² =
  9. 9.99² =
  10. 10.47² =
  11. 11.55² =
  12. 12.41² =
  13. 13.96² =
  14. 14.36² =
  15. 15.62² =
  16. 16.66² =
  17. 17.48² =
  18. 18.63² =
  19. 19.91² =
  20. 20.72² =
  21. 21.69² =
  22. 22.53² =
  23. 23.54² =
  24. 24.52² =
  25. 25.57² =
  26. 26.77² =
  27. 27.49² =
  28. 28.75² =
  29. 29.74² =
  30. 30.67² =
  31. 31.35² =
  32. 32.37² =
  33. 33.92² =
  34. 34.33² =
  35. 35.84² =
  36. 36.73² =
  37. 37.88² =
  38. 38.38² =
  39. 39.32² =
  40. 40.86² =

Answer key

  1. 9604
  2. 4624
  3. 1849
  4. 2601
  5. 1156
  6. 1521
  7. 8836
  8. 9025
  9. 9801
  10. 2209
  11. 3025
  12. 1681
  13. 9216
  14. 1296
  15. 3844
  16. 4356
  17. 2304
  18. 3969
  19. 8281
  20. 5184
  21. 4761
  22. 2809
  23. 2916
  24. 2704
  25. 3249
  26. 5929
  27. 2401
  28. 5625
  29. 5476
  30. 4489
  31. 1225
  32. 1369
  33. 8464
  34. 1089
  35. 7056
  36. 5329
  37. 7744
  38. 1444
  39. 1024
  40. 7396

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