One of the core difficulties of fifth grade mathematics is decimal multiplication: first multiply by an integer, then order a decimal point, and the child always loses points on the “decimal point”. This 100-question special exercise specializes in treating this pain point, and the answers are printed directly.
Decimal multiplication seems simple, but there are many “pitfalls”: how to count the decimal places of the product? What if there is a 0 at the end of the product? What if the integer part is not enough to write 0? Many fifth-grade children planted their first monthly exam here.
Core Rule
Decimal multiplication takes three steps: ① first calculate the product by integer multiplication; ② count a number and two factors together have several decimal places; ③ count the same number of digits from the right side of the product and point to the decimal point.Decimal places of product = sum of two factor decimal places。
Practice Structure
- 100 decimal multiplication exercises, moderate difficulty;
- Covers one decimal, two decimal multiplication;
- with complete answers and calculation steps.
Error point reminder
- Point the wrong decimal point position – digits first and then point, don’t calculate;
- When the end of the product is 0, click the decimal point first and then simplify;
- Estimation test: 3.2 × 2.8 ≈ 9, if 90 is calculated, it must be wrong.
Practice 10 times a day for two weeks, and the correct rate of decimal multiplication can be stable above 95%.
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