The challenge is deceptively simple—count the total number of dots. But, as with most optical illusions, nothing is quite as simple as it seems. Check out the post here: While at first glance ...

There are 10 fingers on these hands, 10 counters in the ten frame, 10 beads on the string, 10 dots on the ... Let's count in 10s. You can count in 10s using a number line. This number line starts ...