2. Addition and subtraction

Lesson

Do you remember how to make a target number?

Find the missing number to equal the number $98$98.

$89$89$+$+$\editable{}$$=$=$98$98

$20$20$+$+$\editable{}$$=$=$98$98

$28$28$+$+$\editable{}$$=$=$98$98

For our number sentences to be equivalent, both sides need to be equal. Let's see how to check if this is true, as well as how we can make it true.

Complete the number sentence:

$41-\editable{}=11$41−=11

If we need to find a missing number, we can use things such as bridge to $10$10, and number lines to help us. Let's see how we can do this for an addition and a subtraction problem, to make a sentence equal.

Complete the number sentence:

$48-\editable{}=19+16$48−=19+16

Remember!

For number sentences to be equivalent, or balanced, both sides must equal the same amount.

Apply place value to partition, rearrange and regroup numbers to at least tens of thousands to assist calculations and solve problems

Use equivalent number sentences involving addition and subtraction to find unknown quantities