You can browse Amazon's abacus selection here. If you can't get one with 5 and 5 beads in different colors, then get a regular abacus with 10 beads in each row, such as Melissa & Doug classic wooden abacus. The best kind of abacus has each five beads in alternating colors, like the abacus from Schylling you see on the right. I've written about the usage of abacus for learning place value here. With such an abacus children will naturally learn their "tens and ones". This is the prime "toy" to teach numbers beyond ten. One extremely helpful manipulative to buy is a basic 100-bead abacus (10 racks, 10 beads in each).
You can for example use this simple bus activity where people come in (or go out of) the bus on different bus stops to illustrate the meanings of addition and subtraction. The idea is to teach the child the CONCEPTS of addition and subtraction, and not to worry about memorizing addition and subtraction facts (those come in 1st and 2nd grades). From counting you can go on to simple addition and subtraction with small numbers.
#Kindergarten math plus
Then it's the child's turn to take some, and you need to take the same amount plus one more. You take some objects, and ask the child to take for himself as many as you have AND ONE more.
to understand up, down, under, near, on the side, etc.The concepts of equality, more, and less.To count by rote at least to 20, but preferably a little beyond.