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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 623 · 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. 1.69² =
  2. 2.66² =
  3. 3.38² =
  4. 4.39² =
  5. 5.52² =
  6. 6.36² =
  7. 7.49² =
  8. 8.47² =
  9. 9.93² =
  10. 10.57² =
  11. 11.59² =
  12. 12.84² =
  13. 13.44² =
  14. 14.81² =
  15. 15.86² =
  16. 16.97² =
  17. 17.32² =
  18. 18.78² =
  19. 19.73² =
  20. 20.76² =
  21. 21.95² =
  22. 22.74² =
  23. 23.72² =
  24. 24.45² =
  25. 25.82² =
  26. 26.41² =
  27. 27.71² =
  28. 28.61² =
  29. 29.35² =
  30. 30.94² =
  31. 31.48² =
  32. 32.55² =
  33. 33.83² =
  34. 34.54² =
  35. 35.91² =
  36. 36.37² =
  37. 37.67² =
  38. 38.56² =
  39. 39.32² =
  40. 40.63² =

Answer key

  1. 4761
  2. 4356
  3. 1444
  4. 1521
  5. 2704
  6. 1296
  7. 2401
  8. 2209
  9. 8649
  10. 3249
  11. 3481
  12. 7056
  13. 1936
  14. 6561
  15. 7396
  16. 9409
  17. 1024
  18. 6084
  19. 5329
  20. 5776
  21. 9025
  22. 5476
  23. 5184
  24. 2025
  25. 6724
  26. 1681
  27. 5041
  28. 3721
  29. 1225
  30. 8836
  31. 2304
  32. 3025
  33. 6889
  34. 2916
  35. 8281
  36. 1369
  37. 4489
  38. 3136
  39. 1024
  40. 3969

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