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Qingdao Edition Second Grade Mathematics Volume 1	pptx	6 MB

"Watch Magic" PPT courseware

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Upload Time: 2024-11-14

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"Watch Magic" PPT courseware

In the addition equation, each addend is the same, so the addition equation can be rewritten as a multiplication equation.

It is easier to find the sum of several identical addends using multiplication.

8 × 5 = 40

5 × 8 = 40

cause multiplied by cause product

number number

Read: 8 times 5 equals 40

2 + 2 + 2 + 2 + 2 2×5 5×2

4 + 4 + 4 4×3 3×4

5 + 5 + 5 5×3 3×5

3 + 3 + 3 + 2

One factor is 3 and one factor is 4, written as ( ) × ( ).

One factor is 6 and one factor is 8, written as ( ) × ( ).

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"Watching Magic" PPT courseware 5:

"Watching Magic" PPT Courseware 5 What mathematical information is provided in the picture? There is 1 pigeon in each of the three hats. There are 0 pigeons in each of the three hats. 1+1+1=3 (only) 13=3 (only) or 31=3 (only) 0 + 0 + 0 = 0 (only) ) 0 3 = 0 (only) or 0 3 = ..

"Watching Magic" PPT courseware 4:

"Watching Magic" PPT Courseware 4 What mathematical information is provided in the picture? 8 strings of treasure gourds, 5 light boxes each, 4 birds, 6 birds each, 3 cages, 4 birds each. I can calculate: 5+5+5+5+5+5+5+5=40 Use addition to calculate the treasure gourds The number is too troublesome. ... ... ... ... ..

"Watching Magic" PPT Courseware 3:

"Watch Magic" PPT courseware 3 20 + 20 30 30 40 + 7 10 + 15 59 - 9 23 + 7 20 + 38 69 - 9 45 + 5 continuous addition formula 2 + 2 + 2 + 2 + 2 =10 continuous addition formula 4 + 4 + 4 = 12 The continuous addition formula 5 +5 +5 +5=20 ... ... ..

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Update Time: 2024-11-14

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"Watch Magic" PPT courseware