← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 322 · 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. 1.61² =
  2. 2.59² =
  3. 3.29² =
  4. 4.81² =
  5. 5.81² =
  6. 6.19² =
  7. 7.19² =
  8. 8.21² =
  9. 9.39² =
  10. 10.41² =
  11. 11.71² =
  12. 12.41² =
  13. 13.39² =
  14. 14.41² =
  15. 15.71² =
  16. 16.51² =
  17. 17.21² =
  18. 18.69² =
  19. 19.41² =
  20. 20.39² =
  21. 21.81² =
  22. 22.79² =
  23. 23.51² =
  24. 24.69² =
  25. 25.91² =
  26. 26.39² =
  27. 27.61² =
  28. 28.71² =
  29. 29.39² =
  30. 30.81² =
  31. 31.41² =
  32. 32.39² =
  33. 33.59² =
  34. 34.59² =
  35. 35.41² =
  36. 36.89² =
  37. 37.31² =
  38. 38.71² =
  39. 39.79² =
  40. 40.19² =

Answer key

  1. 3721
  2. 3481
  3. 841
  4. 6561
  5. 6561
  6. 361
  7. 361
  8. 441
  9. 1521
  10. 1681
  11. 5041
  12. 1681
  13. 1521
  14. 1681
  15. 5041
  16. 2601
  17. 441
  18. 4761
  19. 1681
  20. 1521
  21. 6561
  22. 6241
  23. 2601
  24. 4761
  25. 8281
  26. 1521
  27. 3721
  28. 5041
  29. 1521
  30. 6561
  31. 1681
  32. 1521
  33. 3481
  34. 3481
  35. 1681
  36. 7921
  37. 961
  38. 5041
  39. 6241
  40. 361

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