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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 489 · 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. 1.79² =
  2. 2.51² =
  3. 3.39² =
  4. 4.49² =
  5. 5.21² =
  6. 6.59² =
  7. 7.79² =
  8. 8.31² =
  9. 9.81² =
  10. 10.29² =
  11. 11.81² =
  12. 12.29² =
  13. 13.21² =
  14. 14.91² =
  15. 15.21² =
  16. 16.59² =
  17. 17.59² =
  18. 18.89² =
  19. 19.59² =
  20. 20.31² =
  21. 21.91² =
  22. 22.61² =
  23. 23.39² =
  24. 24.19² =
  25. 25.71² =
  26. 26.79² =
  27. 27.19² =
  28. 28.19² =
  29. 29.79² =
  30. 30.59² =
  31. 31.19² =
  32. 32.29² =
  33. 33.89² =
  34. 34.69² =
  35. 35.19² =
  36. 36.71² =
  37. 37.19² =
  38. 38.71² =
  39. 39.91² =
  40. 40.39² =

Answer key

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

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