Here we're going to look at how we can make numbers by adding or taking away.
If we add two numbers together we are going to make a bigger number.
If we start with a number and take away we are going to make a smaller number.
Let's take a look at how we can make new numbers by adding or taking away.
Use the sliders below to try adding and taking away to make a new number!
Worked Examples
QUESTION 1
Which of the following makes $16$16?
There may be more than one correct answer.
$8+8$8+8
A$9+8$9+8
B$9+9$9+9
C$8+7$8+7
D
QUESTION 2
Which of the following makes $6$6?
There may be more than one correct answer.
$8-2$8−2
A$13-10$13−10
B$12-6$12−6
C$15-9$15−9
D
QUESTION 3
Let’s play a game called target number. Here’s how it works. I give you a target number and starting number and you tell me what I need to get there.
For example, our target number is $20$20, and if I tell you the number $19$19 you would say $1$1, because $19+1=20$19+1=20.
Find the missing number below for our target number $20$20.
$18+\editable{}=20$18+=20
$13+\editable{}=20$13+=20
$20+\editable{}=20$20+=20