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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 431 · 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. 2.79² =
  3. 3.39² =
  4. 4.61² =
  5. 5.69² =
  6. 6.79² =
  7. 7.19² =
  8. 8.19² =
  9. 9.89² =
  10. 10.19² =
  11. 11.31² =
  12. 12.49² =
  13. 13.39² =
  14. 14.89² =
  15. 15.21² =
  16. 16.41² =
  17. 17.21² =
  18. 18.61² =
  19. 19.71² =
  20. 20.79² =
  21. 21.71² =
  22. 22.91² =
  23. 23.89² =
  24. 24.69² =
  25. 25.59² =
  26. 26.19² =
  27. 27.21² =
  28. 28.81² =
  29. 29.29² =
  30. 30.29² =
  31. 31.49² =
  32. 32.29² =
  33. 33.19² =
  34. 34.29² =
  35. 35.39² =
  36. 36.41² =
  37. 37.79² =
  38. 38.81² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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