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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 830 · 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. 1.21² =
  2. 2.51² =
  3. 3.89² =
  4. 4.71² =
  5. 5.49² =
  6. 6.59² =
  7. 7.49² =
  8. 8.39² =
  9. 9.21² =
  10. 10.71² =
  11. 11.21² =
  12. 12.41² =
  13. 13.89² =
  14. 14.71² =
  15. 15.71² =
  16. 16.21² =
  17. 17.91² =
  18. 18.61² =
  19. 19.61² =
  20. 20.31² =
  21. 21.81² =
  22. 22.79² =
  23. 23.79² =
  24. 24.31² =
  25. 25.61² =
  26. 26.59² =
  27. 27.39² =
  28. 28.59² =
  29. 29.61² =
  30. 30.29² =
  31. 31.19² =
  32. 32.89² =
  33. 33.31² =
  34. 34.61² =
  35. 35.79² =
  36. 36.49² =
  37. 37.41² =
  38. 38.71² =
  39. 39.71² =
  40. 40.19² =

Answer key

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

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