I. Decimal multiplication:

1, decimal times integer.

2. Approximate value of product (rounding) Multiply, add and subtract.

3. Integer multiplication is extended to decimals (commutative law, distributive law and associative law).

Second, the fractional division:

1, decimal divided by integer.

2, the divisor quotient (rounded, pay attention to the actual situation in the application problem).

Third, observe the object (simply understand the front view, side view and top view).

Fourth, simple equation:

The letter represents the thought equation of number: the equation with unknown number is called equation. For example: 5x+32 = 47, 6 (a+2) = 47.

Five, polygon area:

1, parallelogram area = ah.

2. Triangle area = ah ÷ 2.

3. Trapezoidal area = (a+b) × h ÷ 2.

4. The area of the combined graph.

6. Statistics and possibilities.

Seven, mathematics wide angle.

Eight, the general review.