SIDUYG 2 in 1 Math Stamp, Addition and Subtraction Practice within 100, Dual Head Teaching Stamp for Kids, Educational Supply, Rubber Stamp, Blue, Rectangular

I love these because you can change the numbers and it makes quick work out of making timed practice tests or just for practice. I like that they have lids and that you can add ink again. I'll be looking at the Multiplication and Division ones when we need them! Hope you find this helpful!

got this for a kid who loves math and loves playing teacher. she laughed when she got it as a gift, but still thought it was cool. Its nice that you can rotate the numbers to get different combinations of problems to solve. The ink isn't completely consistent , but really it works just fine. it did also come with a small refill of ink. not sure how exactly to go about doing that...well see if we even need it. its fun and practical. for some reason I though it was a two pack, but its just one.

This product comes with ink. The ink is kind of messy if touched before it is dry (as you would expect with ink). It is easy to set down and just roll. You can change the numbers for a large variety of problems to solve. Both ends of this product have rollers with caps. One end is addition, the other end is subtraction.

very messy and cheap

In theory, this is a good idea but it's not practical. It was messy and the text are too small. It comes with refillable ink but no instruction on how to replace it, and if it's what I am thinking it's going to be messy refilling the ink. The ink also takes a minute to dry, definitely take your time before giving it to your kids to work it.I do like that the subtraction and addition are on either side, so you can choose one or the other.