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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 870 · 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. 1.41² =
  2. 2.19² =
  3. 3.29² =
  4. 4.31² =
  5. 5.91² =
  6. 6.71² =
  7. 7.39² =
  8. 8.49² =
  9. 9.69² =
  10. 10.19² =
  11. 11.69² =
  12. 12.39² =
  13. 13.69² =
  14. 14.39² =
  15. 15.41² =
  16. 16.79² =
  17. 17.19² =
  18. 18.81² =
  19. 19.71² =
  20. 20.59² =
  21. 21.81² =
  22. 22.49² =
  23. 23.81² =
  24. 24.49² =
  25. 25.41² =
  26. 26.91² =
  27. 27.91² =
  28. 28.29² =
  29. 29.81² =
  30. 30.49² =
  31. 31.31² =
  32. 32.69² =
  33. 33.21² =
  34. 34.81² =
  35. 35.79² =
  36. 36.41² =
  37. 37.59² =
  38. 38.71² =
  39. 39.61² =
  40. 40.79² =

Answer key

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

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