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Chapter 13 Addition Decoder

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Chapter 13 Addition Decoder

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Mix of addition and place value

Created by

Hidden Author
Hidden Author
Lebanon

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Chapter 13 Addition Decoder
 

Chapter 13 Addition DecoderOnline version

Mix of addition and place value

by Hidden Author
1

I am the sum of 18 and 6. What number am I?

Hints

Break 18 into 10 + 8, then add 6 to 8 to get 14. Add the 10 back to get 24.

Think of 18 + 6 as 18 + 6 = 24.

Add the two addends.

2

I am the sum of 19 and 5. What number am I?

Hints

Alternatively: 19 + 5 = (20 - 1) + 5 = 24.

Add the tens and the carried value: 10 + 10 = 20, plus 4 equals 24.

Combine the ones: 9 + 5 = 14, carry over 1 to the tens.

3

I am the sum of 25 and 7. What number am I?

Hints

30 + 2 = 32.

Add the tens plus carry: 2 tens + 1 ten = 3 tens, which is 30.

Add the ones: 5 + 7 = 12, write 2 and carry 1.

4

I am the sum of 27 and 6. What number am I?

Hints

30 + 3 = 33.

Add the tens plus carry: 2 tens + 1 ten = 3 tens, which is 30.

Add the ones: 7 + 6 = 13, write 3 and carry 1.

5

I am the sum of 25 and 2. What number am I?

Hints

20 + 7 = 27.

The tens stay as 2 tens (20).

Add the ones: 5 + 2 = 7.

6

I am the sum of 27 and 1. What number am I?

Hints

20 + 8 = 28.

Tens stay the same: 2 tens (20).

Add the ones: 7 + 1 = 8.

7

I am the sum of 30 and 4. What number am I?

Hints

30 + 4 = 34.

Tens: 3 tens plus any carry (none) = 3 tens (30).

Add the ones: 0 + 4 = 4, no carry.

8

I am the sum of 25 and 3. What number am I?

Hints

20 + 8 = 28.

Tens remain: 2 tens (20).

Add the ones: 5 + 3 = 8.

9

In the number 19, how many ones are there?

Hints

The ones place shows how many ones there are: 9.

Look at the digit in the ones place of 19.

10

In the number 25, how many tens are there?

Hints

There are two tens, which makes 20.

Look at the digit in the tens place of 25.

 
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