1, in a/8, when a= (), the fractional value is equal to 0; When a= (), it is the decimal unit of the score; When a= (), it is the maximum true score; When a= (), it can be converted into integer1; When a= (), it is the smallest mistake.
2. Fill in ">" in ○. "<" or "=".
2/ 13 ○ 2/3 5/6 ○7/20 2/5 ○ 1/9 1/2 ○ 1/3
3,2/9+5/9 means * * has () 1/9, and the sum is ().
4、4/ 13 + 8/ 13 = ( )+( )/ 13 =( )/ 13
5/8 + 7/8 = ( )+( )/8 =( )
5. One wire is 4/5 meters long, the other is shorter than it by 1/7 meters, and the other is () meters long.
6, 19/20 minus 13/20 minus (), the difference is 1/4.
7. Dig a three-day canal to complete the task. On the first day, 1/3 of the total length was dug, on the second day, 1/2 of the total length was dug, and on the third day, () of the total length was dug.
8, rectangle, length 12/5 meters, width more than 3/4 meters, width is () meters.
9. Find out the rules of filling in the blanks.
3/9 、4/ 12 、5/ 15 、6/ 18 ( ) 1/2 、 1/4 、 1/8 、 1/ 16 、( )、( )
Second, distinguish one.
1、 1/6 + 5/6 =6/ 12 = 1/2 ( )
2. The difference between three 1/5 and four 0. 1 is 0.2. ( )
3、5- 15/7 = 30/7 ( )
4. In 1/2, 5/8, 7/ 14 and 2/3, 7/ 14 and 2/3 cannot be converted into finite decimals. ( )
5. The decimal unit of11/8 is1/8, and it has 10 such decimal units. ( )
6. Multiplying a number by 0.0 1 is equivalent to reducing this number to the original1100. ( )
7. Only three true scores are below 4/5. ( )
8. Divide the two cakes to four people equally, and each person will get 1/4 pieces. ( )
Third, choose a choice.
1, the following decimals can be converted into finite decimals ()
a、7/35 B、7/ 12 C、5/6 D、5/42
2. The biggest factor () of a number is its smallest multiple.
A is greater than b and less than c, equal to
3. The following result is not 1/2 ().
a、 1/4 + 1/4 B、2/5 + 1/ 10 C、3/7 - 1/3 D、7/ 12- 12
4、25/ 100 =( )
a、2.5 B、2.05 C、2.005 D、2500
5. For Canal A, it takes 3 days to complete the project 1/2, 7 days to complete the project, and 3 days to complete the project 1/5. Then, for A, B and C, the slowest project is ().
uncertain
6. Use 1 subtract 1/8 every time, and subtract () times to get 0.
a、6 B、7 C、8 D、9
7, Li Shifu processing two parts in 3 hours, the average time required for each part is () hours.
a、2/3 B、 1/ 12 C、 1/3 D、 1/2
8. Party A, Party B and Party C donated 15 yuan, while Party A donated 834 yuan, 2 12 yuan less than Party B. How much did Party C donate? The correct formula is ()
a、 15-834 -(834 +2 12)
b、 15-834 - 2 12
c、 15-834 (834 -2 12)
Fourth, do math.
1, write directly.
3/4 + 14 2 + 4/9 1-7/ 1 1 1/7 + 3/7 +5/7 3-3/4 2/3 + 1/6 3/ 10 - 1/5 5/ 16 - 1/ 16 - 1/ 16
2. Decimal numbers, which turn fractions into decimals.
23/20 4/7 1/8 34/25
5.625 0.27 0.3 2.4
3. Solve the equation
x+ 1/6 = 1/4 5/7+x = 1x-3/ 10 = 1/5
4. Calculate the following questions.
1/9 +3/6 - 1/3 5/6 - 1/3 +2/3 7/8 + 1/4 - 13
5. Cut the ribbon into two sections, the first section accounts for 5/ 12 of the total length and the second section accounts for 1/4 of the total length. What percentage of the total length are the two sections cut?
6. For a batch of fruits, bananas account for 1/8, apples account for 1/4 and watermelons account for 2/5 of the total weight.
(1) How much do apples and watermelons account for this batch of fruits?
(2) How much do these three fruits * * * account for in the total weight?
(3) What other math questions can you ask? Try to solve it.