← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 470 · 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. 1.31² =
  2. 2.69² =
  3. 3.89² =
  4. 4.19² =
  5. 5.29² =
  6. 6.89² =
  7. 7.49² =
  8. 8.91² =
  9. 9.39² =
  10. 10.29² =
  11. 11.49² =
  12. 12.59² =
  13. 13.29² =
  14. 14.19² =
  15. 15.59² =
  16. 16.71² =
  17. 17.19² =
  18. 18.49² =
  19. 19.51² =
  20. 20.41² =
  21. 21.61² =
  22. 22.69² =
  23. 23.29² =
  24. 24.71² =
  25. 25.71² =
  26. 26.41² =
  27. 27.71² =
  28. 28.49² =
  29. 29.61² =
  30. 30.79² =
  31. 31.29² =
  32. 32.89² =
  33. 33.71² =
  34. 34.19² =
  35. 35.79² =
  36. 36.51² =
  37. 37.39² =
  38. 38.49² =
  39. 39.89² =
  40. 40.19² =

Answer key

  1. 961
  2. 4761
  3. 7921
  4. 361
  5. 841
  6. 7921
  7. 2401
  8. 8281
  9. 1521
  10. 841
  11. 2401
  12. 3481
  13. 841
  14. 361
  15. 3481
  16. 5041
  17. 361
  18. 2401
  19. 2601
  20. 1681
  21. 3721
  22. 4761
  23. 841
  24. 5041
  25. 5041
  26. 1681
  27. 5041
  28. 2401
  29. 3721
  30. 6241
  31. 841
  32. 7921
  33. 5041
  34. 361
  35. 6241
  36. 2601
  37. 1521
  38. 2401
  39. 7921
  40. 361

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths