"Approximate Value of Product" Decimal Multiplication PPT Courseware 3

Description

"Approximate Value of Product" Decimal Multiplication PPT Courseware 3

Teaching goal: To enable students to use the "rounding method" to intercept the approximate value of a decimal when the product is a decimal.

Key point: The approximation of the quadrature can be correct according to actual needs.

Difficulty: Flexibly use the "rounding method" to obtain approximate values.

Study: Think independently.

1. Oral calculation

0.5×0.6 0.3×0.3

3.5×0.2 0.7×0.11

3.2×3 0.125×8

1-0.48 0.94×1

Old knowledge navigation

The "rounding method" is commonly used to find approximate numbers.

To retain an integer, it depends on whether the first decimal part is 5 or not.

To retain one decimal place, it depends on whether the second decimal place is full of 5.

To retain two decimal places, it depends on whether the third decimal place reaches 5.

Accurate to single digits, that is, keep integers;

Accurate to tenths, that is, retaining one decimal place;

Accurate to the hundredth, that is, retaining two decimal places;

1. Fill in the blanks:

The product of 2.34×0.02 has ( ) decimal places. The accuracy to 0.001 is approximately (), and the rounding to the hundredth is approximately ().

The mantissa after omitting the tenth place of 7.898 is (), remove the third digit after the decimal point, the approximate value is (), and round to an integer is ().

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Update Time: 2024-09-08

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 1 industry PPT template

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