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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 142 · 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. 1.49² =
  2. 2.21² =
  3. 3.21² =
  4. 4.89² =
  5. 5.59² =
  6. 6.19² =
  7. 7.71² =
  8. 8.49² =
  9. 9.31² =
  10. 10.21² =
  11. 11.51² =
  12. 12.89² =
  13. 13.49² =
  14. 14.49² =
  15. 15.91² =
  16. 16.31² =
  17. 17.61² =
  18. 18.89² =
  19. 19.91² =
  20. 20.71² =
  21. 21.89² =
  22. 22.49² =
  23. 23.51² =
  24. 24.21² =
  25. 25.39² =
  26. 26.91² =
  27. 27.59² =
  28. 28.39² =
  29. 29.29² =
  30. 30.21² =
  31. 31.39² =
  32. 32.19² =
  33. 33.49² =
  34. 34.89² =
  35. 35.21² =
  36. 36.39² =
  37. 37.19² =
  38. 38.79² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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