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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 804 · 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. 1.79² =
  2. 2.59² =
  3. 3.89² =
  4. 4.41² =
  5. 5.21² =
  6. 6.49² =
  7. 7.89² =
  8. 8.91² =
  9. 9.89² =
  10. 10.41² =
  11. 11.71² =
  12. 12.79² =
  13. 13.29² =
  14. 14.41² =
  15. 15.49² =
  16. 16.59² =
  17. 17.61² =
  18. 18.49² =
  19. 19.29² =
  20. 20.39² =
  21. 21.69² =
  22. 22.19² =
  23. 23.91² =
  24. 24.19² =
  25. 25.79² =
  26. 26.49² =
  27. 27.39² =
  28. 28.79² =
  29. 29.59² =
  30. 30.59² =
  31. 31.59² =
  32. 32.89² =
  33. 33.69² =
  34. 34.51² =
  35. 35.71² =
  36. 36.69² =
  37. 37.31² =
  38. 38.41² =
  39. 39.19² =
  40. 40.59² =

Answer key

  1. 6241
  2. 3481
  3. 7921
  4. 1681
  5. 441
  6. 2401
  7. 7921
  8. 8281
  9. 7921
  10. 1681
  11. 5041
  12. 6241
  13. 841
  14. 1681
  15. 2401
  16. 3481
  17. 3721
  18. 2401
  19. 841
  20. 1521
  21. 4761
  22. 361
  23. 8281
  24. 361
  25. 6241
  26. 2401
  27. 1521
  28. 6241
  29. 3481
  30. 3481
  31. 3481
  32. 7921
  33. 4761
  34. 2601
  35. 5041
  36. 4761
  37. 961
  38. 1681
  39. 361
  40. 3481

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