算数

位取りで16 + 16

16 + 16 を、数を十の位と一の位に分けて、12個の1をまとめ直し、位ごとに合わせて32にする方法を学びます。

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Forbes

Problem

Can you please tell me $16 + 16$ with explanation?

Step 1: Break Numbers into Place Values

To add $16 + 16$ , break each number into tens and ones.

Each $16$ is made of $1$ ten and $6$ ones:

16 = 10 + 6

So,

16 + 16 = (10 + 6) + (10 + 6)

This means we have $2$ tens and $12$ ones.

Step 2: Add the Ones

Now add the ones:

6 + 6 = 12

So the ones make $12$ ones.

Step 3: Regroup the Ones

Since $12$ ones is more than $10$ ones, we regroup.

$10$ ones make $1$ ten, with $2$ ones left over:

12 = 10 + 2

So $12$ ones becomes $1$ ten and $2$ ones.

Step 4: Add the Tens

Now add the tens.

We started with $2$ tens, and regrouping gave us $1$ more ten:

2 + 1 = 3

So we have $3$ tens.

Step 5: Combine Tens and Ones

$3$ tens means $30$ , and $2$ ones means $2$ .

Now combine them:

30 + 2 = 32

So,

16 + 16 = 32

概念

Understanding Addition

Learning what addition means: putting two groups together to find the total. Recognizing the plus sign and the equal sign, and understanding that the order of addends does not change the sum.

Addition Facts Within 20

Adding two numbers where the sum is between 11 and 20. Strategies include making a ten (for example, $8 + 5 = 8 + 2 + 3 = 13$ ), using doubles like $7 + 7 = 14$ , and near doubles like $6 + 7 = 6 + 6 + 1 = 13$ .

Understanding Multiplication

Learning that multiplication is a shortcut for adding equal groups. For example, $4 \times 3$ means 4 groups of 3, which is the same as $3 + 3 + 3 + 3 = 12$ . Can be shown with arrays, equal groups, and jumps on a number line.

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