First, write the number directly.
16×6= 500×7= 3 18×0= 600×4=
90×30= 120×40= 16×40= 200×6=
2 1×70= 150×6= 270×3= 290×3=
Fill in the blanks.
The product of 1 and 50×90 has () zeros at the end.
2. 15 times 20 to get () ten, and the product is ().
3. Two digits are multiplied by two digits, and the product may be () digits or () digits.
4. The school bought 43 boxes of oil pastels, each box 14 yuan. The vertical formula for calculating the total price is as follows. Please complete the left vertical position and fill in the blanks.
1 4
× 4 3 (1) Buy 3 boxes of oil pastels and pay () yuan;
(2) Buy 40 boxes of oil pastels and pay () yuan;
(3) Buy 40 boxes of oil pastels and pay () yuan;
5.()× () = total price ()× () = total workload.
() × () = total output () × () = distance
6. Omit the mantissa after the highest digit of the following figures and find its approximate value.
97≈ 523≈ 972≈ 8449≈
7. When one factor is multiplied by another factor, the last bit of the product should be aligned with the () bit of the factor.
8. When finding the divisor of a number, the method of () is generally adopted.
9.3823 The mantissa after omitting the highest digit is about (), and the mantissa after omitting the hundred digits is about ().
10, the product of two minimum two digits is (), and the product of the maximum two digits and the minimum two digits is ().
1 1. To ask the total price of a batch of math books, you must know the () and () of the books.
Second, judge. (Mark "√" for the right and "╳" for the wrong)
() 1, 500×20= 1000, the product is missing a 0.
() 2, the total amount of work, you must know the work efficiency and time.
() 3, each scarf 20 yuan, each suit 100 yuan, my mother sold 23 sets. How much did * * * charge? The formula is 20×23.
() 4. Li Shifu processes 38 parts per hour. How many parts can you process in 4 hours? This is a question of total output.
Fourth, write the following questions.
27×38= 48×45= 149×36=
209×25= 450× 12= 848÷8=
750+3560= 370×40= 567× 13=
Check calculation: Check calculation:
Five, the formula to calculate the following problems.
35× 12÷7 380-280÷4 729÷( 1000-99 1)
( 126+75)×60 620÷2×30 60×23- 1728÷8
Six, column calculation.
What is the 43 times of 1 and 123? How many times is the product of 2, 56 and 36 6?
2. What is the quotient of120 divided by 8 times 90?
4. A number is 320 less than 12 times 45. What's this number?
Seven, application questions.
1, a set of insect specimens 75 yuan, Teacher Zhang bought 24 sets, one * * *, how much is it? (Write out the quantitative relationship in the problem first, and then solve it continuously)
2. How much did _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ cost? (Add a condition first, then answer)
3. Li Ming goes shopping by bike, walking every minute160m, 8 minutes. ________________? (Add a question before you answer)
There are 840 peach trees in the orchard, and there are 28 fewer apple trees than peach trees. How many apple and peach trees are there?
5. "Six? First of all, before Children's Day, grade three students make paper flowers to decorate the classroom. There are 36 students in the class, each of whom makes 5 paper flowers on average. After the paper flowers are made, 80 are given to the children in kindergarten, and the rest are put in the classroom. How many paper flowers are there to decorate the classroom?
6. Uncle Wang keeps 38 ducks, 17 geese, and the number of chickens is twice that of ducks and geese. How many chickens does Uncle Wang keep?
7. Five rows of loquat trees were newly planted in the orchard, each row was 15, and 60 peach trees were newly planted. How many new fruit trees have been planted in the orchard?
8. When Xiao Wang started to learn typing, he could only type 15 words per minute. Now the number of typing per minute is nine times that of the beginning. Now I am typing an article of 1000 words for 7 minutes. How many words have not been typed?