850-50= 270+60= 520-500= 1600-400=

5800-700= 230+60= 340-90= 170+400=

300+600= 800-200= 640-400= 870-30=

700-90= 420+300= 500+220= 530-80=

Second, fill in.

1. When 600+900 is calculated orally, it can be thought that: () one hundred plus () one hundred is () one hundred, which is ().

2. When calculating 1 17+265, use () to add a bit () to get (), input 1 into () and write a bit with ().

3. When calculating 183-58, it is not enough to subtract 8 from 3 digits, so subtract 1 from () and add () to () for subtraction.

4. When calculating addition and subtraction, you should first align with () and start counting from () bit.

5. What's the difference between the largest three digits and the smallest three digits? The column type is ().

6. When calculating 507-348+2 14, calculate () first and then ().

7. In the mixed operation without brackets, only when adding and subtracting, the calculation is carried out in the order of ().

8. When calculating 681-(316+128), calculate () first and then ().

9. A number minus two numbers in a row equals this number minus ().

10. 1 17 and the sum of 324 is more than 196? The formula is ().

Third, I will be a little judge.

1. When calculating the addition, one digit is full of ten, and one digit goes into ten digits. ( )

2. Whether calculating addition and subtraction, you should start from the high position. ( )

How much is 3.46 more than 238? The formula is 238-46. ( )

4. If the calculation subtraction is not enough, subtract 1 from the last digit and 10 from the standard. ( )

5. When calculating 67+ 135, 6 and 3 are aligned, and 7 and 5 are aligned. ( )

What is 6.427 minus 189 plus 76? The formula is 427- 189+76. ( )

7.807 minus the sum of 242 and 164, the formula is 807-242+ 164. ( )

8.364+(472-286) should be the calculation method of adding first and then subtracting. ( )

Fourth, multiple choice questions.

1. When calculating three-digit addition and subtraction, you should start counting from the () bit.

One, one B, one C and one hundred.

2. Where the figures add up to ten, it is ().

A, backward a b, forward a c, forward a into one.

3. The largest three digits are greater than the largest two digits ().

a、800 B、900 C、899

4. The sum of167+234+96 is ().

a、487 B、497 C、507

When calculating 5.286+(70 1-437), you must first calculate ().

A, addition b, subtraction c, in turn.

6.980-46 1-239 can be written as () and then calculated.

a、980-46 1+239 B、980+46 1-239 C、980-(46 1+239)

Five, column vertical calculation.

185+273 42 1-237

Check calculation: Check calculation:

344+ 182 709-367

Check calculation: Check calculation:

197+56 348+ 106

Check calculation: Check calculation:

Sixth, mixed operation.

334+ 1 14+285 837-268- 179 423+ 198+45

920-364-239 358+ 107-259 604-406+ 187

934-(647+238) 524+(334-2 19) 8 14-(253+ 1 18)

Seven, solve the problem.

1. The original price of a bicycle is 585 yuan, and the current price is 390 yuan. How much cheaper?

2. Uncle Wang keeps 273 chickens, 158 ducks. How much did Uncle Wang taste?

The fruit shop bought 280 boxes of oranges, and sold 157 boxes a week. How many boxes of oranges are left?

In the skipping competition, Lingling jumped 128 for the first time, 135 for the second time and 162 for the third time. How many times did Lingling jump three times?

5. There are 220 poplars and 245 pines planted on the hillside, and the number of cypresses is less than the sum of poplars and pines 178. How many cypresses have been planted?

6. The supermarket shipped 500 popsicles, which sold 2 15 in the first week and 234 in the second week. How much is left in the third week? Please use two methods to calculate.

Eight, column calculation.

What is the sum of 1? 243 and 409 are more than 288?

What is the sum of 2.43 1 minus 176 plus 245?

What's the difference between 3.734 and 3 18 plus 254?

What is the result of subtracting 486 and 2 15 from 4.9 14 respectively?

5. What is the number less than 275 times 49?

How much is 6.296 more than 588?