Trend Enterprises: Three-Corner Addition and Subtraction Flash Cards, T1670, Interactive Self-Checking, Exciting Way for Everyone to Learn, 48 Two-Sided Cards Included, Ages 6 and Up

Good quality cards. Perfect for helping my child to see and memorize “fact families.” He also is more willing to do these with me than traditional math flash cards. I appreciate the plastic holder they come in. Way better than sliding cards in and out of a cardboard box that always ends up ripping.

We love these 3 corner flash cards. We also have the addition/multiplication set. We like to use these over all other flash cards that we have tried. They make it easy and fun. They are very thick, durable cards. Perfect size.

Great learning tool at home since the triangle method is being used in schools.

I got these for my 7 year old twins who are in first grade and doing well in math. Math is a priority in our house and we love any opportunity to highlight the relationships between numbers and operations. These cards do just that and offer good opportunities to talk about numbers and how they might relate to one another. I think it's generally a good idea to present addition as an operation fluidly related to subtraction (and vice versa) as opposed to presenting the two as rigidly different operations. Along the same lines, these cards organize the material in a way that allows us to play games with numbers (i.e. I see 3 numbers on my card. I'll tell you 2 of them and you need to guess the third --which easily be adapted to suit a variety of exercises and math conversations). I also appreciated the quality of the cards themselves: in the process of handling them they felt solid and well-constructed as opposed to being flimsy and easily bent.

This is a great resource for teaching addition and subtraction! It not only allows for drilling of the tables up to 12, but introduces and reenforces the understanding of the inter-relationship between addition and subtraction. The student learns, for example, that 2+3 = 5, 3+2=5, and therefore 5-2=3 and 5-3=2 - all it one card! In my opinion, this form of teaching is much more effective, helpful, and interesting than simply drilling each addition and subtraction problem separately. The only problem I foresee is that the cards present the answers too easily if one does not cover a corner in time. I think that it will probably best be used in conjunction with traditional flash cards and tables. Finally, I left off one star because the cards have rough edges; it seems that they are printed on sheets and perforated and are removed from the sheets before packaging. They have perforation "bumps" all along two of the three sides. They would be nicer if they had smooth edges and perhaps were printed on smoother, shiner card-stock such as that used for most decks of regular playing cards. All in all, and intriguing and useful product.

If you are looking for flashcards, these are the best. Because of the triangular layout, learning math facts, especially math families, becomes simplified. Get these and you will be glad you did. They are worth every penny. You should also get the multiplication and division cards. They are big enough for classroom use by teacher, and small enough for little hands too.

I love these flash cards. I almost didn't get them cause the idea was a new concept to me and I wasn't convinced but they work out really well and are actually a bit fun to use. The little notch in the middle is genius and allows you to hold the cards in your hand steadily while covering either corner. There are so many possibilities we actually don't drill them all in one day! It takes 4 days to drill the complete set for us. The case is sturdy enough too.

My kid's teacher uses these in the classroom and when my kid asked for some at home I figured, why not? It's nice that you can add and subtract using the same card.

Perfect for our little one

A great tool for teaching adding and subtracting.

A little pricey

I like them, good to practice math fact with students.

So funny !!!