You can use multiplication to check your division answer this way.

1. Do the division problem.
2. Multiply the quotient times the divisor.
3. If there is a remainder, add it to the multiplication product.
4. Compare this answer to the dividend. They should be the same number (630 = 630).

The first step in estimating a sum or a difference is to round the numbers, by changing them to the nearest power of ten, hundred, thousand, etc. Round the numbers first, then use mental math to estimate an answer. When rounding, follow these rounding rules: If the number being rounded is less than 5, round down.

A reasonable estimate does not exceed the original numbers in a problem. For instance, in a division problem like 424 ÷ 4 − 10, we can check is our answer is reasonable or not, by estimating an approximate answer or by plugin gin using the division formula.

The principle requires that any restriction of individual freedom must be appropriate to the attainment of the objectives to be achieved. reasonableness. Following this principle every legislative and administrative act is subject to the control of the Constitutional Court.

Angles are measured in degrees, written °. The maximum angle is 360°. This is the angle all the way round a point. Half of this is the angle on a straight line, which is 180°.

Example: What is the size of Angle CBX? Angle ADB = 32° also equals Angle ACB.

Intercepted arc formula

1. The central angle = the measure of the intercepted arc.
2. 2 x the inscribed angle = the intercepted arc.
3. The inscribed angle = half the sum of intercepted arcs.
4. The size of the vertex angle outside the circle = 1/2 × (difference of intercepted arcs)