← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 273 · 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. 2.61² =
  3. 3.59² =
  4. 4.61² =
  5. 5.51² =
  6. 6.79² =
  7. 7.61² =
  8. 8.49² =
  9. 9.71² =
  10. 10.49² =
  11. 11.69² =
  12. 12.19² =
  13. 13.69² =
  14. 14.59² =
  15. 15.29² =
  16. 16.19² =
  17. 17.41² =
  18. 18.19² =
  19. 19.39² =
  20. 20.21² =
  21. 21.91² =
  22. 22.19² =
  23. 23.49² =
  24. 24.79² =
  25. 25.69² =
  26. 26.31² =
  27. 27.39² =
  28. 28.89² =
  29. 29.51² =
  30. 30.49² =
  31. 31.49² =
  32. 32.69² =
  33. 33.59² =
  34. 34.39² =
  35. 35.49² =
  36. 36.19² =
  37. 37.19² =
  38. 38.41² =
  39. 39.19² =
  40. 40.79² =

Answer key

  1. 961
  2. 3721
  3. 3481
  4. 3721
  5. 2601
  6. 6241
  7. 3721
  8. 2401
  9. 5041
  10. 2401
  11. 4761
  12. 361
  13. 4761
  14. 3481
  15. 841
  16. 361
  17. 1681
  18. 361
  19. 1521
  20. 441
  21. 8281
  22. 361
  23. 2401
  24. 6241
  25. 4761
  26. 961
  27. 1521
  28. 7921
  29. 2601
  30. 2401
  31. 2401
  32. 4761
  33. 3481
  34. 1521
  35. 2401
  36. 361
  37. 361
  38. 1681
  39. 361
  40. 6241

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