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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 108 · 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. 2.89² =
  3. 3.29² =
  4. 4.61² =
  5. 5.89² =
  6. 6.29² =
  7. 7.19² =
  8. 8.21² =
  9. 9.61² =
  10. 10.61² =
  11. 11.89² =
  12. 12.49² =
  13. 13.49² =
  14. 14.19² =
  15. 15.29² =
  16. 16.21² =
  17. 17.69² =
  18. 18.79² =
  19. 19.91² =
  20. 20.21² =
  21. 21.61² =
  22. 22.41² =
  23. 23.39² =
  24. 24.81² =
  25. 25.29² =
  26. 26.61² =
  27. 27.79² =
  28. 28.91² =
  29. 29.49² =
  30. 30.49² =
  31. 31.19² =
  32. 32.49² =
  33. 33.71² =
  34. 34.49² =
  35. 35.29² =
  36. 36.19² =
  37. 37.61² =
  38. 38.39² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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