1, further master the characteristics of cuboids and cubes, calculate their surface areas and volumes, and make students know the meaning of volume. Let the students know the commonly used volume and unit of volume (cubic meter, cubic decimeter, cubic centimeter, liter, milliliter) and calculate its surface area and volume.

2. Further enable students to master the concepts of divisor and multiple, prime number and composite number, and the characteristics of numbers divisible by 2, 3 and 5; Will decompose prime factors; Will find the greatest common divisor and the least common multiple.

Make students understand the meaning and basic properties of fractions, compare the sizes of fractions, make false fractions, band fractions and integers transform each other, and be skilled in division and division of fractions.

3. Further enable students to understand the significance of the addition and subtraction of scores, master the calculation rules of the addition and subtraction of scores, and skillfully calculate the addition and subtraction of scores.

4. Through practical activities, let students experience the close relationship between mathematics and daily life, and further cultivate students' mathematics application consciousness and hands-on operation ability.

(2), review points:

1, to further let students know the meaning of volume; Mastering the characteristics of cuboids and cubes will calculate their surface areas and volumes. Know the commonly used volume and unit of volume, and be able to rewrite simple names.

2. Further enable students to master the concepts of divisor and multiple, prime number and composite number, and decompose prime factors; Will find the greatest common divisor and the least common multiple.

3. Further understand the meaning and basic properties of scores, compare the sizes of scores, exchange fake scores, band scores and integers, and skillfully divide and divide scores.

4. Further understand the significance of the addition and subtraction of scores, master the calculation rules of the addition and subtraction of scores, and skillfully calculate the addition and subtraction of scores.

(3), review difficulties:

1, master the characteristics of cuboids and cubes, calculate their surface areas and volumes, know the commonly used volumes and unit of volume, and rewrite simple names.

2, will decompose the prime factor; Will find the greatest common divisor and the least common multiple.

3, can do false fractions, with fractions, integers, and can skillfully divide and divide.

4. Master the calculation rules of fractional addition and subtraction, and skillfully calculate fractional addition and subtraction.