Choose three calculations to work out using a written method. Choose three to work out using Frog.

Question

ScanSolve AI Tutor · Accepted Answer

here are the calculations using the specified methods:

Written method

(1) Calculation: $8642 - 4318$

Set up the subtraction in columns.

$$
\begin{array}{r}
8642 \\
- 4318 \\
\hline
\end{array}
$$

Subtract the units column
$2 - 8$ . Borrow from the tens. $12 - 8 = 4$ .
Subtract the tens column
$3 - 1 = 2$ .
Subtract the hundreds column
$6 - 3 = 3$ .
Subtract the thousands column
$8 - 4 = 4$ . $\begin{array}{r} 86^34^12 \\ - 4318 \\ \hline \mathbf{4324} \\ \end{array}$ The answer is $\boxed{\mathbf{4324}}$ .
- (2) Calculation: $7458 - 3275$

Set up the subtraction in columns.

$$
\begin{array}{r}
7458 \\
- 3275 \\
\hline
\end{array}
$$

Subtract the units column
$8 - 5 = 3$ .
Subtract the tens column
$5 - 7$ . Borrow from the hundreds. $15 - 7 = 8$ .
Subtract the hundreds column
$3 - 2 = 1$ .
Subtract the thousands column
$7 - 3 = 4$ . $\begin{array}{r} 74^35^18 \\ - 3275 \\ \hline \mathbf{4183} \\ \end{array}$ The answer is $\boxed{\mathbf{4183}}$ .
- (3) Calculation: $4721 + \boxed{?} = 8645 \implies 8645 - 4721$

Set up the subtraction in columns.

$$
\begin{array}{r}
8645 \\
- 4721 \\
\hline
\end{array}
$$

Subtract the units column
$5 - 1 = 4$ .
Subtract the tens column
$4 - 2 = 2$ .
Subtract the hundreds column
$6 - 7$ . Borrow from the thousands. $16 - 7 = 9$ .
Subtract the thousands column
$7 - 4 = 3$ . $\begin{array}{r} 8^76^145 \\ - 4721 \\ \hline \mathbf{3924} \\ \end{array}$ The missing number is $\boxed{\mathbf{3924}}$ .

Frog
- (1) Calculation: $762 - 345$
Start at 345.
Jump to the next multiple of 10.
$345 \xrightarrow{+5} 350$
Jump to the next multiple of 100.
$350 \xrightarrow{+50} 400$
Jump to a number close to 762.
$400 \xrightarrow{+300} 700$
Jump to the target number.
$700 \xrightarrow{+62} 762$
Add up all the jumps.
$5 + 50 + 300 + 62 = 417$ The answer is $\boxed{\mathbf{417}}$.
- (2) Calculation: $6008 - 3489$
Start at 3489.
Jump to the next multiple of 100.
$3489 \xrightarrow{+11} 3500$
Jump to the next multiple of 1000.
$3500 \xrightarrow{+500} 4000$
Jump to a number close to 6008.
$4000 \xrightarrow{+2000} 6000$
Jump to the target number.
$6000 \xrightarrow{+8} 6008$
Add up all the jumps.
$11 + 500 + 2000 + 8 = 2519$ The answer is $\boxed{\mathbf{2519}}$.
- (3) Calculation: $\pounds100 - \pounds78.25$
Start at $\pounds78.25$ .
Jump to the next whole pound.
$\pounds78.25 \xrightarrow{+\pounds0.75} \pounds79.00$
Jump to the next multiple of $\pounds10$ .
$\pounds79.00 \xrightarrow{+\pounds1.00} \pounds80.00$

Jump to the target amount.

$\pounds80.00 \xrightarrow{+\pounds20.00} \pounds100.00$

Add up all the jumps.

$\pounds0.75 + \pounds1.00 + \pounds20.00 = \pounds21.75$  
The answer is $\boxed{\mathbf{\pounds21.75}}$.

Choose three calculations to work out using a written method. Choose three to work out using Frog.

Step-by-step solution

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Start at 345.

Jump to the next multiple of 100.

Jump to a number close to 762.

Jump to the target number.

Add up all the jumps.

Start at 3489.

Jump to the next multiple of 1000.

Jump to a number close to 6008.

Jump to the target number.

Add up all the jumps.

Start at $\pounds78.25$ .

Jump to the next multiple of $\pounds10$ .

Jump to the target amount.

Add up all the jumps.

Still stuck on this one?

More Mathematics Questions

Choose three calculations to work out using a written method. Choose three to work out using Frog.

Step-by-step solution

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Set up the subtraction in columns.

Subtract the units column

Subtract the tens column

Subtract the hundreds column

Subtract the thousands column

Start at 345.

Jump to the next multiple of 100.

Jump to a number close to 762.

Jump to the target number.

Add up all the jumps.

Start at 3489.

Jump to the next multiple of 1000.

Jump to a number close to 6008.

Jump to the target number.

Add up all the jumps.

Start at £78.25\pounds78.25£78.25.

Jump to the next multiple of £10\pounds10£10.

Jump to the target amount.

Add up all the jumps.

Still stuck on this one?

More Mathematics Questions

Start at $\pounds78.25$ .

Jump to the next multiple of $\pounds10$ .