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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 490 · 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. 2.31² =
  3. 3.59² =
  4. 4.71² =
  5. 5.91² =
  6. 6.39² =
  7. 7.89² =
  8. 8.61² =
  9. 9.29² =
  10. 10.61² =
  11. 11.49² =
  12. 12.81² =
  13. 13.61² =
  14. 14.91² =
  15. 15.91² =
  16. 16.29² =
  17. 17.61² =
  18. 18.29² =
  19. 19.21² =
  20. 20.79² =
  21. 21.31² =
  22. 22.41² =
  23. 23.21² =
  24. 24.31² =
  25. 25.21² =
  26. 26.69² =
  27. 27.79² =
  28. 28.61² =
  29. 29.19² =
  30. 30.79² =
  31. 31.19² =
  32. 32.31² =
  33. 33.71² =
  34. 34.61² =
  35. 35.61² =
  36. 36.79² =
  37. 37.21² =
  38. 38.49² =
  39. 39.81² =
  40. 40.89² =

Answer key

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

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