There are points at the top of the mountain, and there is a combination at the top of the mountain; The top of the mountain faces the mother and asks her to supplement;

Point to decimals and open to large numbers; ? The opening on the left is greater than the symbol >, and the opening on the right is smaller than the symbol.

The remaining two are babies. Find the baby and subtract.

Senior one mathematics is divided into the following methods:

1, break the law of ten, add nine and subtract one, add eight and subtract two, add seven and subtract three, add six and subtract four, and add five to see five.

2. Digital resolution method, 9+6 = 9+(1+5) = (9+1)+5 =15,156,246,336,426,5/kloc-. The ingredients of 6 are not lacking. 167, 257, 347, 437, 527, 6 17; Remember the composition of 7 carefully.

Carry addition within 3, 20, look at large numbers, divide them into decimals, make up ten, and add the remainder.

4, abdication subtraction, abdication subtraction should be kept in mind, first subtract from the unit; Who is not enough to retire, don't forget to add ten to the standard; If the interval is 1, it is best to remember that 0 becomes 10.

5, subtraction of continuous abdication, see 0, go forward and see which one has it. Borrowed and walked back, 0 is a bit like 9.

Sample sharing:

1, plus 8+5, you think of 2 when you see 8, so 5 can be divided into 2 and 3, 8 and 2 10,/kloc-0+3 =13, so 8+5 = 13.

2. The subtraction of 15-9 and15 can be divided into 10 and 5, 10-9 = 1, and then 1+5 = 6, so15.