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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 431 · 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. 1.72² =
  2. 2.57² =
  3. 3.89² =
  4. 4.97² =
  5. 5.69² =
  6. 6.38² =
  7. 7.79² =
  8. 8.35² =
  9. 9.91² =
  10. 10.44² =
  11. 11.88² =
  12. 12.47² =
  13. 13.77² =
  14. 14.43² =
  15. 15.39² =
  16. 16.36² =
  17. 17.83² =
  18. 18.61² =
  19. 19.63² =
  20. 20.98² =
  21. 21.75² =
  22. 22.54² =
  23. 23.34² =
  24. 24.48² =
  25. 25.59² =
  26. 26.33² =
  27. 27.71² =
  28. 28.81² =
  29. 29.76² =
  30. 30.99² =
  31. 31.96² =
  32. 32.78² =
  33. 33.41² =
  34. 34.93² =
  35. 35.31² =
  36. 36.66² =
  37. 37.62² =
  38. 38.37² =
  39. 39.64² =
  40. 40.67² =

Answer key

  1. 5184
  2. 3249
  3. 7921
  4. 9409
  5. 4761
  6. 1444
  7. 6241
  8. 1225
  9. 8281
  10. 1936
  11. 7744
  12. 2209
  13. 5929
  14. 1849
  15. 1521
  16. 1296
  17. 6889
  18. 3721
  19. 3969
  20. 9604
  21. 5625
  22. 2916
  23. 1156
  24. 2304
  25. 3481
  26. 1089
  27. 5041
  28. 6561
  29. 5776
  30. 9801
  31. 9216
  32. 6084
  33. 1681
  34. 8649
  35. 961
  36. 4356
  37. 3844
  38. 1369
  39. 4096
  40. 4489

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