38+24= 700+600= 2700-900 = 25×800= 820,000-540,000 = 650+360= 485+565,438+05 = 820-330 = 123+98.
Second, the column vertical calculation and vertical checking calculation
4383+2647= Answer 5843-3669 = Answer
Third, find the unknown X.
X+572 = 1486 X-360 = 235 85+X = 188 582-X = 167
Fourth, use a simple method to calculate: (write down the calculation process)
429+202= answer 278+99= answer 582- 103 = answer 804-397 = answer.
5. List the equations with unknowns and calculate them.
1 540 minus a number gives 136. What's this number?
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How much is 2.365 less than 782?
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fill (up) a vacancy
1 and 520 plus () get 1254.
2. One addend is 56, the other is 4 times of it, and the other is (). The sum of these two addends is ().
3. The minuend is five times that of the subtree, the subtree is 2 1, the minuend is (), and the difference is ().
4. The number of A is 229 more than that of B. The number of A is 68 1 and the number of B is ().
5.208- 127 = 8 1. The formula is (), and the subtraction calculation should be ().
6. Write a quantitative relationship or equation according to the meaning of the question:
There is 150 kg of rice. I ate x kilograms, and there are 38 kilograms left.
① () ○ () = remaining kilograms, and the formula is: () ○ () = 38kg.
② () ○ () = 150kg, and the formula is () ○ () = 150kg.
The sum of the two addends is 820. If one number increases 15, the other number remains the same, and the sum is (), one addend remains the same, the other decreases 15 and the sum is ().
Seven, multiple choice questions
1. In the calculator, it means () clear key.
Answer. Close b.on/c.c.ce.
What is the sum of the products of 2436 plus 5 1 and 6? The correct formula is ().
a . 436+5 1×6 b .(436+5 1)×6 C . 436×6+5 1
3. Solve the unknown equation 738-x = 174. The correct answer is ().
A.X = 738- 174 = 554 B . X = 738+ 174 = 9 12 C . X = 738- 174 = 564
4. Calculate the formula 50 1-298 with a simple method, and the simple process is correct ().
a . 500-300- 1+2 b . 500-300+ 1-2 c . 500-300- 1-2d . 500-300+ 1+2
8. True or false: (Mark "√" for the right and "×" for the wrong)
1, the sum minus an addend. One more addend. ( )。
2. The calculation result of x+52 =168 is X= 1 16. ( )。
3. Use "minuend = difference+subtraction" to check the addition. ( )。
Subtract a number from 265 to get 80. The number subtracted is 185. ( )。
5. One addend increases by 22, the other addend decreases by 10, and increases by 32. ( )。
Nine, application questions
1. There are 50 bulls in the cattle farm, and the number of cows is 9 times that of bulls. How many cows are raised in the cattle farm?
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2. There are 522 senior students in a school, which is three times that of middle school students. How many more senior students are there than middle school students?
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3. Length of a bundle of wires 100 meter. It took 32 meters for the first time and 23 meters for the second time. At this time, how many meters is the wire shorter than before?
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The store shipped out 5400 kilograms of sugar, and after selling some of it, there were still 690 kilograms left. How many kilograms did you sell? (Answer in two ways)
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5. There are 788 literature books in the school library, less than science books 1 15. How many science books are there? (List the equations whose unknown number is x and then solve them. )
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6. An air conditioner 2 188 yuan, but Mr. Wang only brought 1950 yuan. How much more does he need to go back to buy this air conditioner? (List the equations whose unknown number is x and then solve them. )
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X. Other issues
1, find a pattern to fill in the blanks
① 10 1+ 102+ 103+ 104+ 105 =( )×( )。
② 1 1+ 13+ 15+ 17+ 19+2 1+23=( + )×3+( )。
2, a subtraction formula, the minuend is 83, and the sum and difference of its subtraction are divided by the minuend, and the quotient is ().
3. The sum of the minuend, subtree and difference of a subtraction formula is 456, and the difference is three times that of subtree. So the subtraction formula is: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
4. There are 96 students in Class (1) and Class (2), 89 students in Class (2) and Class (3), and 86 students in Class (3) and Class (4). How many people are there in Class (1) and Class (4)?
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There are 42 people on the bus. When you arrive at a station, you get off some people and get on five people. There are still 35 people in the car at this time. How many people get off at this stop?