How do you divide and multiplcation
2 answers:
Answer:
Step-by-step explanation:
When you divide to find the number of groups, the division is called measuring or repeated subtraction. You can keep subtracting 4 from 24 until you reach 0. Each 4 you subtract is a group or basket.
Because division is the inverse, or “opposite,” of multiplication, you can use arrays to help students understand how multiplication and division are related. If in multiplication we find the product of two factors, in division we find the missing factor if the other factor and the product are known.
In the multiplication model below, you multiply to find the number of counters in all. In the array division model, you divide to find the number of counters in each group. The same three numbers are used. The model shows that division “undoes” multiplication and multiplication “undoes” division. So when multiplying or dividing, students can use a fact from the inverse operation. For example, if students know that 4 × 5 = 20, they also know the related division fact 20 ÷ 4 = 5 or 20 ÷ 5 = 4. Students can also check their work by using the inverse operation.
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Given:
A circle is centered on point B.
Points A, C and D lie on its circumference.
If measures 40°.
To find:
The .
Solution:
Central angle theorem: According to this theorem, the central angle is equal to the twice of inscribed angle on the same intercepted arc.
In the given figure is the central angle and
is the inscribed angle on the same arc AC.
Using central angle theorem, we get
Therefore, the measure of angle ADC is 20°.