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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 180 · 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. 1.39² =
  2. 2.36² =
  3. 3.33² =
  4. 4.55² =
  5. 5.54² =
  6. 6.43² =
  7. 7.88² =
  8. 8.91² =
  9. 9.42² =
  10. 10.45² =
  11. 11.95² =
  12. 12.93² =
  13. 13.96² =
  14. 14.37² =
  15. 15.72² =
  16. 16.38² =
  17. 17.81² =
  18. 18.51² =
  19. 19.48² =
  20. 20.61² =
  21. 21.79² =
  22. 22.74² =
  23. 23.71² =
  24. 24.59² =
  25. 25.67² =
  26. 26.69² =
  27. 27.34² =
  28. 28.46² =
  29. 29.84² =
  30. 30.86² =
  31. 31.94² =
  32. 32.83² =
  33. 33.31² =
  34. 34.68² =
  35. 35.89² =
  36. 36.53² =
  37. 37.47² =
  38. 38.87² =
  39. 39.32² =
  40. 40.41² =

Answer key

  1. 1521
  2. 1296
  3. 1089
  4. 3025
  5. 2916
  6. 1849
  7. 7744
  8. 8281
  9. 1764
  10. 2025
  11. 9025
  12. 8649
  13. 9216
  14. 1369
  15. 5184
  16. 1444
  17. 6561
  18. 2601
  19. 2304
  20. 3721
  21. 6241
  22. 5476
  23. 5041
  24. 3481
  25. 4489
  26. 4761
  27. 1156
  28. 2116
  29. 7056
  30. 7396
  31. 8836
  32. 6889
  33. 961
  34. 4624
  35. 7921
  36. 2809
  37. 2209
  38. 7569
  39. 1024
  40. 1681

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