Count the balls. Pick the card with the same amount.
We’re shown an amount of balls and we’re told that we need to count them. Here’s one, two, three, four, five, six, seven, eight. There are eight balls altogether. Now, we have to pick the card, which has the same amount of balls. So, we’re looking for the card, which shows eight red balls.
In the second group, we have an amount of balls. They look different to our group. The eight balls in the first group are placed one on top of the other. On this card, we’ve got two rows, which have four balls in them. Two rows of four makes eight: four, five, six, seven, eight. But there’s one more at the bottom. So altogether, this card has nine.
Now, let’s count how many balls there are on the second card. These balls have been placed in a kind of circle pattern: two, three, four, five, six, seven, eight. This is the card which has the same amount. This is the group which has the same amount of balls. We counted the balls and there were eight. This is the card, which also shows eight balls.
You might have been tricked into thinking that this was the right group. Because the balls are all in a straight line. The card with the same amount is this one.