I found a website, Simply Charlotte Mason, which had a posted question from a parent who needed help for her child to learn math facts. One of the responses was from a parent who was using Two Plus Two Is Not Five.
"My daughter is finally making progress on her addition/subtraction facts since we’ve been working through a book called Two Plus Two is Not Five by Susan Greenwald. We used the RightStart abacus, different ways of doing flashcards, online games, card games – but she always ended up in tears. The Greenwald book teaches all of the facts using tricks. It’s very incremental – you start with one trick, practice it, add another trick, practice both tricks and so on. It’s really helping – she’s gaining so much confidence, and making so much progress. We are about 75% of the way through the book – and I’m already placing an order for the next book on multiplication."
