1. Be familiar with the method of adding and subtracting mixed numbers within 100, and calculate accurately.

2. Cultivate the awareness and ability to estimate and solve simple practical problems.

3. Cultivate students' skilled and accurate calculation ability and careful calculation habits.

Teaching focus:

Proficiently and accurately master the addition and subtraction mixed operation method within 100, and the calculation is accurate.

Teaching difficulties:

Master the mixed operation method of addition and subtraction within 100, and calculate skillfully and accurately.

Teaching aid preparation:

projector

Teaching process:

First, show an 8-page theme map.

1, observe the theme of the picture.

2. Tell me what mathematical information you found?

3. Discussion and communication: How to calculate continuously? Why are you doing this?

Secondly, show the second question on page 8.

1, observe the theme of the picture.

2. Analyze and solve practical problems

(1), what mathematical information did you find?

(2) Here is 100 yuan. What two kinds of toys do you want to buy? How much is left?

(3) Which two toys have the most money left? How much is left?

(4) What kind of toys do you need to spend 100 yuan on? Would you please answer?

3. Student report and revision.

Third, vertical calculation.

56+ 2 1– 18 = 39– 13 + 47=

96–34 – 35 = 57 +22 -45=

48+32- 16 = 100 -69+ 25 =

Fourth, summary.

What did you learn from this course?