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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 734 · 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. 1.71² =
  2. 2.39² =
  3. 3.51² =
  4. 4.19² =
  5. 5.91² =
  6. 6.29² =
  7. 7.79² =
  8. 8.41² =
  9. 9.21² =
  10. 10.39² =
  11. 11.89² =
  12. 12.39² =
  13. 13.59² =
  14. 14.31² =
  15. 15.89² =
  16. 16.19² =
  17. 17.29² =
  18. 18.49² =
  19. 19.91² =
  20. 20.61² =
  21. 21.41² =
  22. 22.19² =
  23. 23.69² =
  24. 24.61² =
  25. 25.79² =
  26. 26.41² =
  27. 27.39² =
  28. 28.49² =
  29. 29.21² =
  30. 30.91² =
  31. 31.61² =
  32. 32.49² =
  33. 33.41² =
  34. 34.71² =
  35. 35.41² =
  36. 36.49² =
  37. 37.81² =
  38. 38.19² =
  39. 39.49² =
  40. 40.79² =

Answer key

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

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