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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 178 · 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. 1.94² =
  2. 2.99² =
  3. 3.85² =
  4. 4.52² =
  5. 5.53² =
  6. 6.48² =
  7. 7.69² =
  8. 8.81² =
  9. 9.54² =
  10. 10.39² =
  11. 11.35² =
  12. 12.61² =
  13. 13.87² =
  14. 14.68² =
  15. 15.95² =
  16. 16.71² =
  17. 17.82² =
  18. 18.41² =
  19. 19.78² =
  20. 20.96² =
  21. 21.67² =
  22. 22.86² =
  23. 23.97² =
  24. 24.75² =
  25. 25.84² =
  26. 26.64² =
  27. 27.47² =
  28. 28.45² =
  29. 29.55² =
  30. 30.62² =
  31. 31.89² =
  32. 32.63² =
  33. 33.79² =
  34. 34.37² =
  35. 35.33² =
  36. 36.73² =
  37. 37.49² =
  38. 38.83² =
  39. 39.66² =
  40. 40.91² =

Answer key

  1. 8836
  2. 9801
  3. 7225
  4. 2704
  5. 2809
  6. 2304
  7. 4761
  8. 6561
  9. 2916
  10. 1521
  11. 1225
  12. 3721
  13. 7569
  14. 4624
  15. 9025
  16. 5041
  17. 6724
  18. 1681
  19. 6084
  20. 9216
  21. 4489
  22. 7396
  23. 9409
  24. 5625
  25. 7056
  26. 4096
  27. 2209
  28. 2025
  29. 3025
  30. 3844
  31. 7921
  32. 3969
  33. 6241
  34. 1369
  35. 1089
  36. 5329
  37. 2401
  38. 6889
  39. 4356
  40. 8281

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