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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 846 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.89² =
  2. 2.19² =
  3. 3.39² =
  4. 4.39² =
  5. 5.81² =
  6. 6.39² =
  7. 7.19² =
  8. 8.31² =
  9. 9.71² =
  10. 10.31² =
  11. 11.49² =
  12. 12.21² =
  13. 13.49² =
  14. 14.79² =
  15. 15.21² =
  16. 16.79² =
  17. 17.49² =
  18. 18.71² =
  19. 19.21² =
  20. 20.89² =
  21. 21.79² =
  22. 22.31² =
  23. 23.61² =
  24. 24.41² =
  25. 25.91² =
  26. 26.21² =
  27. 27.89² =
  28. 28.69² =
  29. 29.79² =
  30. 30.49² =
  31. 31.39² =
  32. 32.19² =
  33. 33.59² =
  34. 34.91² =
  35. 35.91² =
  36. 36.21² =
  37. 37.61² =
  38. 38.31² =
  39. 39.69² =
  40. 40.61² =

Answer key

  1. 7921
  2. 361
  3. 1521
  4. 1521
  5. 6561
  6. 1521
  7. 361
  8. 961
  9. 5041
  10. 961
  11. 2401
  12. 441
  13. 2401
  14. 6241
  15. 441
  16. 6241
  17. 2401
  18. 5041
  19. 441
  20. 7921
  21. 6241
  22. 961
  23. 3721
  24. 1681
  25. 8281
  26. 441
  27. 7921
  28. 4761
  29. 6241
  30. 2401
  31. 1521
  32. 361
  33. 3481
  34. 8281
  35. 8281
  36. 441
  37. 3721
  38. 961
  39. 4761
  40. 3721

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