How to simplify the calculation

How to simplify the calculation

996 ten 699 one 502
=（1000-4）+（700-1）-（500+2）
=1000+700-500-4-1-2
=1200-7
=1193

What is the simple calculation of 99 × 69?

99×69
=(100-1)×69
=100x69-69x1
=6900-69
=6831
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Calculation of 149 * 69-149 + 149 * 32 with simple method

149*69-149+149*32
=149*(69-1+32)
=149*100
=14900
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The number of people who subscribe to newspapers and magazines at the age of six is 69, five out of six subscribe to Juvenile Science and technology daily, and two out of three subscribe to English weekly. How much is the total number of people in grade six

Let's assume that everything is ordered
The number of students in Grade 6 is 69 / (5 / 6 + 2 / 3-1) = 138

How to do problem 6 on page 69

No problem

How much is eight times one tenth plus ten times one twelfth plus twelve times one fourteenth plus fourteen times one sixteenth plus sixteen times one eighteenth
Cheng!)

Eight times one tenth plus ten times one twelfth plus twelve times one fourteenth plus fourteen times one sixteenth plus sixteen times one eighteenth
=1/2x(1/8-1/10)+1/2x(1/12-1/14)+1/2x(1/14-1/16)+1/2x(1/14-1/16)
=1/2x(1/8-1/16)
=1/2x1/16
=1/32

3 out of 4 minus 0.6 times (2 and 5 out of 12 minus 1.75)
Do it with a trailer

3 out of 4 minus 0.6 times (2 and 5 out of 12 minus 1.75)
=3/4-3/5x(29/12-7/4)
=3/4-3/5x(29/12-21/12)
=3/4-3/5x2/3
=3/4-2/5
=7/20

How much is 2 / 3 + 4 / 9 times 3 / 4 minus 1 / 2

2 / 3 + 4 / 9 times 3 / 4 minus 1 / 2 bracket = 2 / 3 + 4 / 9 * (3 / 4-1 / 2) = 2 / 3 + 4 / 9 * (3 / 4-2 / 4) = 2 / 3 + 4 / 9 * 1 / 4 = 6 / 9 + 1 / 9 = 7 / 9, which is equal to 7 / 9

Two fifths minus one equals one fifths

It's two fifths

Seven out of eighteen times seven?

49 out of 18