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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 751 · 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. 1.49² =
  2. 2.39² =
  3. 3.31² =
  4. 4.19² =
  5. 5.89² =
  6. 6.69² =
  7. 7.29² =
  8. 8.19² =
  9. 9.21² =
  10. 10.79² =
  11. 11.79² =
  12. 12.29² =
  13. 13.59² =
  14. 14.71² =
  15. 15.69² =
  16. 16.69² =
  17. 17.79² =
  18. 18.31² =
  19. 19.31² =
  20. 20.19² =
  21. 21.59² =
  22. 22.79² =
  23. 23.61² =
  24. 24.49² =
  25. 25.21² =
  26. 26.41² =
  27. 27.41² =
  28. 28.29² =
  29. 29.71² =
  30. 30.41² =
  31. 31.91² =
  32. 32.89² =
  33. 33.29² =
  34. 34.19² =
  35. 35.59² =
  36. 36.31² =
  37. 37.39² =
  38. 38.29² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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