Illustrative Mathematics
Illustrative Mathematics: 5.nbt Elmer's Multiplication Error
Fifth graders are presented with the calculations for a multiplication problem and are asked to explain why the answer is incorrect. They must use estimation, identify the error, show the correct arithmetic, and find the answer another...
AAA Math
Aaa Math: Multiplication of Two and Three Digit Numbers
Explains the traditional way to multiply three-digit by two-digit numbers. Gives practice and games to practice this skill.