1. Oral calculation
20÷2= 3000÷3= 4000÷5= 840÷2=
96÷3= 2 10÷7= 320÷8= 5000÷5=
Oral answer
There are () tens in (1)60? There are () hundreds in six hundred.
There are () ten and () one in 56.
(3)360 has () hundred and () ten.
(4) There are () thousand in 5000, which can also be regarded as () hundred.
Do oral calculations
180÷30
Fill in the appropriate numbers in the box below.
120 \u 0 & gt； three
calculate
Subtract an integer from 320 and divide the difference by this integer. The quotient is 7. What is this integer?
Answer:
1. 10, 1000,800,420,32,30,40, 1000
2.( 1)6, 6(2) 5,6 (3)3,6 (4)5,50
3. Analysis: Think about how many 30s are in 180. Using the multiplication formula, 368 is six 30s, which is 180, so 180÷30=6. Solution: 180÷30=6
4. Analysis: According to the meaning of the question: 120 divided by dozens is greater than 3, 120 ÷ 40 = 3, the quotient is greater than 3, and the divisor must be an integer less than 40, that is, 30,20, 10. Solution: 3,2, 1 to be filled in □.
5. Analysis: The answer to this question can be counted backwards. The quotient of the difference divided by this integer decimal is 7, which means that the difference is 7 times that of this integer decimal. The "earned difference" is the result of "320 minus an integer ten", which means that 320 is an integer ten more than the "earned difference". So 320 is equivalent to (7+ 1) times this integer. From this, we can find the integer solution: 320÷(7+ 1)=40 A: this integer is 40.