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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 390 · 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. 1.89² =
  2. 2.49² =
  3. 3.35² =
  4. 4.56² =
  5. 5.86² =
  6. 6.36² =
  7. 7.43² =
  8. 8.62² =
  9. 9.82² =
  10. 10.91² =
  11. 11.37² =
  12. 12.48² =
  13. 13.98² =
  14. 14.94² =
  15. 15.78² =
  16. 16.39² =
  17. 17.66² =
  18. 18.54² =
  19. 19.95² =
  20. 20.88² =
  21. 21.75² =
  22. 22.64² =
  23. 23.79² =
  24. 24.41² =
  25. 25.31² =
  26. 26.67² =
  27. 27.51² =
  28. 28.47² =
  29. 29.42² =
  30. 30.33² =
  31. 31.92² =
  32. 32.44² =
  33. 33.69² =
  34. 34.34² =
  35. 35.57² =
  36. 36.97² =
  37. 37.74² =
  38. 38.52² =
  39. 39.61² =
  40. 40.85² =

Answer key

  1. 7921
  2. 2401
  3. 1225
  4. 3136
  5. 7396
  6. 1296
  7. 1849
  8. 3844
  9. 6724
  10. 8281
  11. 1369
  12. 2304
  13. 9604
  14. 8836
  15. 6084
  16. 1521
  17. 4356
  18. 2916
  19. 9025
  20. 7744
  21. 5625
  22. 4096
  23. 6241
  24. 1681
  25. 961
  26. 4489
  27. 2601
  28. 2209
  29. 1764
  30. 1089
  31. 8464
  32. 1936
  33. 4761
  34. 1156
  35. 3249
  36. 9409
  37. 5476
  38. 2704
  39. 3721
  40. 7225

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