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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 622 · 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. 1.78² =
  2. 2.57² =
  3. 3.43² =
  4. 4.49² =
  5. 5.34² =
  6. 6.86² =
  7. 7.38² =
  8. 8.79² =
  9. 9.58² =
  10. 10.95² =
  11. 11.37² =
  12. 12.83² =
  13. 13.97² =
  14. 14.44² =
  15. 15.66² =
  16. 16.88² =
  17. 17.52² =
  18. 18.39² =
  19. 19.36² =
  20. 20.71² =
  21. 21.51² =
  22. 22.69² =
  23. 23.67² =
  24. 24.91² =
  25. 25.31² =
  26. 26.98² =
  27. 27.82² =
  28. 28.62² =
  29. 29.92² =
  30. 30.68² =
  31. 31.53² =
  32. 32.84² =
  33. 33.65² =
  34. 34.46² =
  35. 35.87² =
  36. 36.94² =
  37. 37.48² =
  38. 38.81² =
  39. 39.85² =
  40. 40.61² =

Answer key

  1. 6084
  2. 3249
  3. 1849
  4. 2401
  5. 1156
  6. 7396
  7. 1444
  8. 6241
  9. 3364
  10. 9025
  11. 1369
  12. 6889
  13. 9409
  14. 1936
  15. 4356
  16. 7744
  17. 2704
  18. 1521
  19. 1296
  20. 5041
  21. 2601
  22. 4761
  23. 4489
  24. 8281
  25. 961
  26. 9604
  27. 6724
  28. 3844
  29. 8464
  30. 4624
  31. 2809
  32. 7056
  33. 4225
  34. 2116
  35. 7569
  36. 8836
  37. 2304
  38. 6561
  39. 7225
  40. 3721

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