Tools/raw materials: white paper, brushes.

Methods/steps

1. Draw a text box as shown in white paper.

2. Write "Double Mind Map" in the text box.

3. Draw two levels of titles on both sides, and then add the related content of "multiple mind maps" to the two levels of titles.

4. Add a few smaller branches to the branch and add relevant content, so that the mind map is done.

Supplementary knowledge

1, the meaning of multiple: a number consists of several other numbers or a number is the sum of several other numbers, indicating that this number is several times that of another number. For example, 8 is 4 times of 2, 8 = 2+2+2+2, and 8 is the sum of 4 2s.

2. Find how many times one number is another: divide by, one number ÷ another number = several times. How many times is 20 4? Because 20 ÷ 4 = 5, 20 is five times that of 4.

3. How many times is a number? Use multiplication. What is 9 times 8? Because 8× 9 = 72, 9 times 8 is 72.

4. Multiple relationships have no units.

5. Find a number several times larger than a number, and use multiplication and addition. How much is six five times bigger than nine? Because 9× 5+6 = 5 1, the number is 5 1.

6. Find a number several times smaller than a number, and use multiplication and subtraction. What is the number less than 6 times of 8 and 5? Because 8× 6-5 = 43, the number is 43.

Multiply multiple numbers by one number.

1, the writing of multiple digits multiplied by one digit

For the alignment of the same number, multiply the number on each number in multiple numbers by one number in turn. If the product of the best digits is more than several tens, it is advanced to the previous digit. If you multiply by which number, the product is written under which number.

2. Multiply by 0 in the middle of the factor

Multiply 0 by any number to get 0; There is a 0 in the middle of the factor. Multiply each digit of a multi-digit number by a number. When multiplying with the middle 0, if there is no number coming up after it, the number will be occupied by a 0, and if there is a number coming up, it must be added up. Simple calculation of multiplication with zero at the end of the factor: when calculating with a pen, you can align one digit with the number before the multi-digit zero, then see how many zeros are at the end of the multi-digit and add several zeros at the end of the product.

Multiply 3, 0 and any number to get 0; Multiply 1 by any number except 0 to get the original number.

4. Three digits multiplied by one digit: the product may be three digits or four digits.