We have been using tens frames and bundles of sticks to make teen numbers. We learned that teens are ten and some more.
"I made 15 with 10 and 5 more." --Emma O.
"I made 19 with a 10 and 9 more." --Lucas
If you’ve noticed your children peering under rocks, staring into grass patches, or excitedly bringing those bugs in the garden lately, you’...