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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 468 · 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. 1.51² =
  2. 2.19² =
  3. 3.61² =
  4. 4.29² =
  5. 5.19² =
  6. 6.81² =
  7. 7.91² =
  8. 8.19² =
  9. 9.79² =
  10. 10.59² =
  11. 11.69² =
  12. 12.19² =
  13. 13.21² =
  14. 14.79² =
  15. 15.89² =
  16. 16.49² =
  17. 17.39² =
  18. 18.49² =
  19. 19.61² =
  20. 20.21² =
  21. 21.79² =
  22. 22.39² =
  23. 23.79² =
  24. 24.79² =
  25. 25.49² =
  26. 26.81² =
  27. 27.39² =
  28. 28.71² =
  29. 29.21² =
  30. 30.41² =
  31. 31.59² =
  32. 32.79² =
  33. 33.89² =
  34. 34.39² =
  35. 35.19² =
  36. 36.19² =
  37. 37.89² =
  38. 38.31² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 2601
  2. 361
  3. 3721
  4. 841
  5. 361
  6. 6561
  7. 8281
  8. 361
  9. 6241
  10. 3481
  11. 4761
  12. 361
  13. 441
  14. 6241
  15. 7921
  16. 2401
  17. 1521
  18. 2401
  19. 3721
  20. 441
  21. 6241
  22. 1521
  23. 6241
  24. 6241
  25. 2401
  26. 6561
  27. 1521
  28. 5041
  29. 441
  30. 1681
  31. 3481
  32. 6241
  33. 7921
  34. 1521
  35. 361
  36. 361
  37. 7921
  38. 961
  39. 6241
  40. 6561

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