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CanadaON
Grade 7

15.01 Solve problems using an algorithm

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.
a

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.

A

We will add $4$4 and $3$3.

B

We will add $1$1 and $8$8.

C
b

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.

A

We will not need to regroup.

B
c

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.

A

We will add $1$1, $8$8 and $1$1.

B

We will add $40$40, $30$30 and $10$10.

C

We will add $40$40 and $30$30.

D
Easy
< 1min

Below is an algorithm for adding two $2$2-digit numbers together.

Easy
< 1min

We are going to add these two numbers together, using the addition algorithm below:

$43+56$43+56

Medium
1min

We are going to add these two numbers together, using the addition algorithm below:

$37+46$37+46

Medium
1min
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Outcomes

7.C3.1

Solve problems and create computational representations of mathematical situations by writing and executing efficient code, including code that involves events influenced by a defined count and/or sub-program and other control structures.

7.C3.2

Read and alter existing code, including code that involves events influenced by a defined count and/or sub-program and other control structures, and describe how changes to the code affect the outcomes and the efficiency of the code.

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