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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 235 · 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. 2.69² =
  3. 3.41² =
  4. 4.79² =
  5. 5.81² =
  6. 6.81² =
  7. 7.29² =
  8. 8.89² =
  9. 9.89² =
  10. 10.49² =
  11. 11.49² =
  12. 12.59² =
  13. 13.29² =
  14. 14.39² =
  15. 15.41² =
  16. 16.71² =
  17. 17.71² =
  18. 18.61² =
  19. 19.61² =
  20. 20.19² =
  21. 21.59² =
  22. 22.41² =
  23. 23.51² =
  24. 24.91² =
  25. 25.41² =
  26. 26.61² =
  27. 27.69² =
  28. 28.61² =
  29. 29.71² =
  30. 30.19² =
  31. 31.49² =
  32. 32.89² =
  33. 33.39² =
  34. 34.59² =
  35. 35.79² =
  36. 36.19² =
  37. 37.39² =
  38. 38.81² =
  39. 39.89² =
  40. 40.91² =

Answer key

  1. 361
  2. 4761
  3. 1681
  4. 6241
  5. 6561
  6. 6561
  7. 841
  8. 7921
  9. 7921
  10. 2401
  11. 2401
  12. 3481
  13. 841
  14. 1521
  15. 1681
  16. 5041
  17. 5041
  18. 3721
  19. 3721
  20. 361
  21. 3481
  22. 1681
  23. 2601
  24. 8281
  25. 1681
  26. 3721
  27. 4761
  28. 3721
  29. 5041
  30. 361
  31. 2401
  32. 7921
  33. 1521
  34. 3481
  35. 6241
  36. 361
  37. 1521
  38. 6561
  39. 7921
  40. 8281

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