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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 693 · 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. 2.21² =
  3. 3.49² =
  4. 4.41² =
  5. 5.81² =
  6. 6.79² =
  7. 7.61² =
  8. 8.71² =
  9. 9.71² =
  10. 10.59² =
  11. 11.91² =
  12. 12.89² =
  13. 13.79² =
  14. 14.19² =
  15. 15.29² =
  16. 16.51² =
  17. 17.41² =
  18. 18.69² =
  19. 19.91² =
  20. 20.79² =
  21. 21.91² =
  22. 22.41² =
  23. 23.61² =
  24. 24.21² =
  25. 25.79² =
  26. 26.39² =
  27. 27.61² =
  28. 28.79² =
  29. 29.19² =
  30. 30.19² =
  31. 31.49² =
  32. 32.21² =
  33. 33.39² =
  34. 34.71² =
  35. 35.51² =
  36. 36.79² =
  37. 37.89² =
  38. 38.39² =
  39. 39.39² =
  40. 40.19² =

Answer key

  1. 361
  2. 441
  3. 2401
  4. 1681
  5. 6561
  6. 6241
  7. 3721
  8. 5041
  9. 5041
  10. 3481
  11. 8281
  12. 7921
  13. 6241
  14. 361
  15. 841
  16. 2601
  17. 1681
  18. 4761
  19. 8281
  20. 6241
  21. 8281
  22. 1681
  23. 3721
  24. 441
  25. 6241
  26. 1521
  27. 3721
  28. 6241
  29. 361
  30. 361
  31. 2401
  32. 441
  33. 1521
  34. 5041
  35. 2601
  36. 6241
  37. 7921
  38. 1521
  39. 1521
  40. 361

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