Answered

Which student correctly describes how to add to use the count up method to 7.49 to find 10-7.49?
Ari
1. Add 9 hundredths.
2. Add 4 tenths.
Nora
1. Add 1 hundredth.
2. Add 6 tenths.
3. Add 2 ones.
The difference is 2.49.
Shama
1. Add 5 hundredths.
2. Add 1 tenth.
3. Add 2 ones.
The difference is 2.15.
O Ari
O Nora
O Shama
3. Add 2 ones.
The difference is 2.61.
Yoko
1. Add 1 hundredth.
2. Add 5 tenths.
3. Add 2 ones.
The difference is 2.51.

Verified Answer :

GinnyAnswer

To determine which student correctly describes how to use the count-up method to find \(\(10 - 7.49\)\), let's examine each student's steps in detail one by one:

### Ari
1. Add 9 hundredths to 7.49:
\(\[ 7.49 + 0.09 = 7.58 \]\)

2. Add 4 tenths to 7.58:
\(\[ 7.58 + 0.4 = 7.98 \]\)

The final sum is 7.98, which is not 10. So, Ari is incorrect.

### Nora
1. Add 1 hundredth to 7.49:
\(\[ 7.49 + 0.01 = 7.50 \]\)

2. Add 6 tenths to 7.50:
\(\[ 7.50 + 0.6 = 8.10 \]\)

3. Add 2 (two ones) to 8.10:
\(\[ 8.10 + 2 = 10.10 \]\)

The difference she stated is 2.49, but we reached 10.10, not 10. Thus, Nora is incorrect.

### Shama
1. Add 5 hundredths to 7.49:
\(\[ 7.49 + 0.05 = 7.54 \]\)

2. Add 1 tenth to 7.54:
\(\[ 7.54 + 0.1 = 7.64 \]\)

3. Add 2 (two ones) to 7.64:
\(\[ 7.64 + 2 = 9.64 \]\)

The final sum is 9.64, not 10, so Shama is incorrect.

### Yoko
1. Add 1 hundredth to 7.49:
\(\[ 7.49 + 0.01 = 7.50 \]\)

2. Add 5 tenths to 7.50:
\(\[ 7.50 + 0.5 = 8.00 \]\)

3. Add 2 (two ones) to 8.00:
\(\[ 8.00 + 2 = 10.00 \]\)

Yoko correctly arrives at 10. Therefore, Yoko's method is correct.

So, the correct student who describes how to use the count-up method to add from 7.49 to find \(\(10 - 7.49\)\) correctly is Yoko.

Therefore, the correct answer is:
\(\[ \boxed{Yoko} \]\)

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