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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 518 · 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. 1.21² =
  2. 2.19² =
  3. 3.61² =
  4. 4.19² =
  5. 5.91² =
  6. 6.21² =
  7. 7.69² =
  8. 8.79² =
  9. 9.39² =
  10. 10.59² =
  11. 11.21² =
  12. 12.81² =
  13. 13.59² =
  14. 14.31² =
  15. 15.71² =
  16. 16.91² =
  17. 17.19² =
  18. 18.19² =
  19. 19.91² =
  20. 20.91² =
  21. 21.19² =
  22. 22.19² =
  23. 23.19² =
  24. 24.81² =
  25. 25.79² =
  26. 26.29² =
  27. 27.49² =
  28. 28.49² =
  29. 29.79² =
  30. 30.69² =
  31. 31.59² =
  32. 32.51² =
  33. 33.69² =
  34. 34.79² =
  35. 35.39² =
  36. 36.79² =
  37. 37.31² =
  38. 38.71² =
  39. 39.51² =
  40. 40.39² =

Answer key

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

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