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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 848 · 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. 1.19² =
  2. 2.49² =
  3. 3.21² =
  4. 4.49² =
  5. 5.41² =
  6. 6.49² =
  7. 7.91² =
  8. 8.21² =
  9. 9.49² =
  10. 10.59² =
  11. 11.61² =
  12. 12.71² =
  13. 13.41² =
  14. 14.91² =
  15. 15.19² =
  16. 16.91² =
  17. 17.39² =
  18. 18.39² =
  19. 19.59² =
  20. 20.59² =
  21. 21.31² =
  22. 22.39² =
  23. 23.21² =
  24. 24.59² =
  25. 25.59² =
  26. 26.59² =
  27. 27.89² =
  28. 28.79² =
  29. 29.21² =
  30. 30.29² =
  31. 31.49² =
  32. 32.69² =
  33. 33.69² =
  34. 34.21² =
  35. 35.19² =
  36. 36.81² =
  37. 37.59² =
  38. 38.51² =
  39. 39.29² =
  40. 40.81² =

Answer key

  1. 361
  2. 2401
  3. 441
  4. 2401
  5. 1681
  6. 2401
  7. 8281
  8. 441
  9. 2401
  10. 3481
  11. 3721
  12. 5041
  13. 1681
  14. 8281
  15. 361
  16. 8281
  17. 1521
  18. 1521
  19. 3481
  20. 3481
  21. 961
  22. 1521
  23. 441
  24. 3481
  25. 3481
  26. 3481
  27. 7921
  28. 6241
  29. 441
  30. 841
  31. 2401
  32. 4761
  33. 4761
  34. 441
  35. 361
  36. 6561
  37. 3481
  38. 2601
  39. 841
  40. 6561

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