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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 355 · 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. 2.21² =
  3. 3.91² =
  4. 4.79² =
  5. 5.21² =
  6. 6.41² =
  7. 7.89² =
  8. 8.71² =
  9. 9.59² =
  10. 10.91² =
  11. 11.39² =
  12. 12.89² =
  13. 13.51² =
  14. 14.21² =
  15. 15.19² =
  16. 16.79² =
  17. 17.61² =
  18. 18.29² =
  19. 19.61² =
  20. 20.71² =
  21. 21.91² =
  22. 22.29² =
  23. 23.41² =
  24. 24.89² =
  25. 25.89² =
  26. 26.89² =
  27. 27.29² =
  28. 28.91² =
  29. 29.19² =
  30. 30.69² =
  31. 31.71² =
  32. 32.49² =
  33. 33.91² =
  34. 34.19² =
  35. 35.79² =
  36. 36.21² =
  37. 37.41² =
  38. 38.41² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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