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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 448 · 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. 3.61² =
  4. 4.69² =
  5. 5.21² =
  6. 6.81² =
  7. 7.49² =
  8. 8.91² =
  9. 9.51² =
  10. 10.21² =
  11. 11.71² =
  12. 12.79² =
  13. 13.81² =
  14. 14.41² =
  15. 15.89² =
  16. 16.19² =
  17. 17.49² =
  18. 18.91² =
  19. 19.71² =
  20. 20.49² =
  21. 21.39² =
  22. 22.59² =
  23. 23.31² =
  24. 24.89² =
  25. 25.49² =
  26. 26.51² =
  27. 27.59² =
  28. 28.79² =
  29. 29.21² =
  30. 30.69² =
  31. 31.89² =
  32. 32.39² =
  33. 33.49² =
  34. 34.61² =
  35. 35.39² =
  36. 36.31² =
  37. 37.59² =
  38. 38.29² =
  39. 39.19² =
  40. 40.21² =

Answer key

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

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