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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 187 · 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. 2.89² =
  3. 3.39² =
  4. 4.71² =
  5. 5.41² =
  6. 6.71² =
  7. 7.31² =
  8. 8.79² =
  9. 9.19² =
  10. 10.31² =
  11. 11.61² =
  12. 12.89² =
  13. 13.29² =
  14. 14.71² =
  15. 15.79² =
  16. 16.39² =
  17. 17.19² =
  18. 18.49² =
  19. 19.59² =
  20. 20.71² =
  21. 21.69² =
  22. 22.31² =
  23. 23.89² =
  24. 24.19² =
  25. 25.31² =
  26. 26.59² =
  27. 27.39² =
  28. 28.21² =
  29. 29.69² =
  30. 30.91² =
  31. 31.29² =
  32. 32.19² =
  33. 33.71² =
  34. 34.89² =
  35. 35.49² =
  36. 36.21² =
  37. 37.89² =
  38. 38.21² =
  39. 39.19² =
  40. 40.91² =

Answer key

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

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