Three-digit multiplication of single digits is the focus of the calculation in the third grade book, and placement is the biggest loss point. This 100-question special exercise covers all carry cases, with standard answers, one page per day, and the calculation is solid. It is easy to learn division afterwards.
The calculation of third-grade multiplication is suddenly large: two digits × one digit ×→ three digits × one digit, the number of incoming digits is many, and it is easy to get confused. Children often “forget to carry in after calculating the number of digits” and “do not add in place after multiplying by 100 digits”. This exercise is specifically for training placement.
Vertical Key Points
- From the individual position, one person multiplies to the left;
- After each step of multiplying, first add the carry bit and then write the result;
- Carrying digits should be written small and clearly;
- Multiply: Divide or recalculate.
Common Errors and Corrections
① Carrier leakage addition: develop the habit of “writing step by step”; ② multiply 0: 0 in the middle of the multiplier and can not be skipped; ③ judge the number of digits of the product: three digits × one digit product may be three digits or four digits, do not write misplaced. 10 courses per day, adhering to 10 days, with an accuracy rate of 95%.
Advanced Suggestions
After completing the 100 questions, you can upgrade to double digits by double digits (fourth grade content), but only if the three digits by single digits are “fast and accurate”. The calculation is progressive, and the foundation needs to be secured.
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