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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 162 · 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. 1.39² =
  2. 2.61² =
  3. 3.91² =
  4. 4.19² =
  5. 5.49² =
  6. 6.31² =
  7. 7.21² =
  8. 8.69² =
  9. 9.91² =
  10. 10.79² =
  11. 11.19² =
  12. 12.59² =
  13. 13.21² =
  14. 14.89² =
  15. 15.91² =
  16. 16.41² =
  17. 17.81² =
  18. 18.59² =
  19. 19.79² =
  20. 20.91² =
  21. 21.49² =
  22. 22.71² =
  23. 23.21² =
  24. 24.21² =
  25. 25.59² =
  26. 26.31² =
  27. 27.29² =
  28. 28.61² =
  29. 29.91² =
  30. 30.29² =
  31. 31.49² =
  32. 32.69² =
  33. 33.39² =
  34. 34.39² =
  35. 35.49² =
  36. 36.41² =
  37. 37.59² =
  38. 38.71² =
  39. 39.21² =
  40. 40.71² =

Answer key

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

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