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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 370 · 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. 1.31² =
  2. 2.79² =
  3. 3.39² =
  4. 4.61² =
  5. 5.91² =
  6. 6.71² =
  7. 7.19² =
  8. 8.79² =
  9. 9.89² =
  10. 10.91² =
  11. 11.71² =
  12. 12.51² =
  13. 13.89² =
  14. 14.19² =
  15. 15.79² =
  16. 16.69² =
  17. 17.19² =
  18. 18.31² =
  19. 19.79² =
  20. 20.61² =
  21. 21.61² =
  22. 22.61² =
  23. 23.21² =
  24. 24.39² =
  25. 25.21² =
  26. 26.71² =
  27. 27.81² =
  28. 28.89² =
  29. 29.49² =
  30. 30.31² =
  31. 31.29² =
  32. 32.41² =
  33. 33.19² =
  34. 34.79² =
  35. 35.39² =
  36. 36.19² =
  37. 37.21² =
  38. 38.21² =
  39. 39.29² =
  40. 40.91² =

Answer key

  1. 961
  2. 6241
  3. 1521
  4. 3721
  5. 8281
  6. 5041
  7. 361
  8. 6241
  9. 7921
  10. 8281
  11. 5041
  12. 2601
  13. 7921
  14. 361
  15. 6241
  16. 4761
  17. 361
  18. 961
  19. 6241
  20. 3721
  21. 3721
  22. 3721
  23. 441
  24. 1521
  25. 441
  26. 5041
  27. 6561
  28. 7921
  29. 2401
  30. 961
  31. 841
  32. 1681
  33. 361
  34. 6241
  35. 1521
  36. 361
  37. 441
  38. 441
  39. 841
  40. 8281

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