Interactive practice questions
Below is an algorithm for adding two $2$2-digit numbers together.
| 1. | Add the units. |
| 2. | If the result of step 1 is at least $10$10, regroup into tens and units. |
| 3. | Add the tens, including any from step 2. |
| 4. | Write the final answer by adding the units to the result of step 3. |
If we use the algorithm to add $41$41 and $38$38, what will happen at step 1?
We will add $40$40 and $30$30.
We will add $4$4 and $3$3.
We will add $1$1 and $8$8.
If we use the algorithm to add $41$41 and $38$38, what will happen at step 2?
We will need to regroup into tens and units.
We will not need to regroup.
If we use the algorithm to add $41$41 and $38$38, what will happen at step 3?
We will add $1$1 and $8$8.
We will add $1$1, $8$8 and $1$1.
We will add $40$40, $30$30 and $10$10.
We will add $40$40 and $30$30.
Below is an algorithm for adding two $2$2-digit numbers together.
We are going to add these two numbers together, using the addition algorithm below:
$43+56$43+56
We are going to add these two numbers together, using the addition algorithm below:
$37+46$37+46