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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 484 · 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. 1.32² =
  2. 2.58² =
  3. 3.61² =
  4. 4.51² =
  5. 5.44² =
  6. 6.86² =
  7. 7.41² =
  8. 8.82² =
  9. 9.34² =
  10. 10.81² =
  11. 11.47² =
  12. 12.97² =
  13. 13.37² =
  14. 14.56² =
  15. 15.35² =
  16. 16.64² =
  17. 17.57² =
  18. 18.91² =
  19. 19.68² =
  20. 20.79² =
  21. 21.84² =
  22. 22.36² =
  23. 23.85² =
  24. 24.49² =
  25. 25.98² =
  26. 26.89² =
  27. 27.76² =
  28. 28.46² =
  29. 29.67² =
  30. 30.88² =
  31. 31.31² =
  32. 32.71² =
  33. 33.54² =
  34. 34.33² =
  35. 35.93² =
  36. 36.74² =
  37. 37.66² =
  38. 38.39² =
  39. 39.48² =
  40. 40.43² =

Answer key

  1. 1024
  2. 3364
  3. 3721
  4. 2601
  5. 1936
  6. 7396
  7. 1681
  8. 6724
  9. 1156
  10. 6561
  11. 2209
  12. 9409
  13. 1369
  14. 3136
  15. 1225
  16. 4096
  17. 3249
  18. 8281
  19. 4624
  20. 6241
  21. 7056
  22. 1296
  23. 7225
  24. 2401
  25. 9604
  26. 7921
  27. 5776
  28. 2116
  29. 4489
  30. 7744
  31. 961
  32. 5041
  33. 2916
  34. 1089
  35. 8649
  36. 5476
  37. 4356
  38. 1521
  39. 2304
  40. 1849

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