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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 48 · 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. 1.19² =
  2. 2.51² =
  3. 3.21² =
  4. 4.49² =
  5. 5.21² =
  6. 6.21² =
  7. 7.21² =
  8. 8.91² =
  9. 9.29² =
  10. 10.19² =
  11. 11.91² =
  12. 12.79² =
  13. 13.51² =
  14. 14.61² =
  15. 15.21² =
  16. 16.51² =
  17. 17.91² =
  18. 18.21² =
  19. 19.69² =
  20. 20.89² =
  21. 21.79² =
  22. 22.59² =
  23. 23.19² =
  24. 24.59² =
  25. 25.89² =
  26. 26.89² =
  27. 27.51² =
  28. 28.49² =
  29. 29.59² =
  30. 30.51² =
  31. 31.49² =
  32. 32.79² =
  33. 33.51² =
  34. 34.39² =
  35. 35.19² =
  36. 36.19² =
  37. 37.61² =
  38. 38.49² =
  39. 39.59² =
  40. 40.89² =

Answer key

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

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