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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 200 · 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. 1.75² =
  2. 2.63² =
  3. 3.49² =
  4. 4.79² =
  5. 5.67² =
  6. 6.48² =
  7. 7.74² =
  8. 8.53² =
  9. 9.44² =
  10. 10.76² =
  11. 11.61² =
  12. 12.86² =
  13. 13.59² =
  14. 14.96² =
  15. 15.51² =
  16. 16.39² =
  17. 17.94² =
  18. 18.66² =
  19. 19.82² =
  20. 20.84² =
  21. 21.87² =
  22. 22.97² =
  23. 23.35² =
  24. 24.69² =
  25. 25.68² =
  26. 26.32² =
  27. 27.91² =
  28. 28.54² =
  29. 29.88² =
  30. 30.41² =
  31. 31.98² =
  32. 32.34² =
  33. 33.42² =
  34. 34.45² =
  35. 35.43² =
  36. 36.36² =
  37. 37.37² =
  38. 38.71² =
  39. 39.64² =
  40. 40.33² =

Answer key

  1. 5625
  2. 3969
  3. 2401
  4. 6241
  5. 4489
  6. 2304
  7. 5476
  8. 2809
  9. 1936
  10. 5776
  11. 3721
  12. 7396
  13. 3481
  14. 9216
  15. 2601
  16. 1521
  17. 8836
  18. 4356
  19. 6724
  20. 7056
  21. 7569
  22. 9409
  23. 1225
  24. 4761
  25. 4624
  26. 1024
  27. 8281
  28. 2916
  29. 7744
  30. 1681
  31. 9604
  32. 1156
  33. 1764
  34. 2025
  35. 1849
  36. 1296
  37. 1369
  38. 5041
  39. 4096
  40. 1089

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