To teach my children (ages 2 and 6) Spanish I have been using a week by week method. Each week I introduce a new focus color. For the color grey I made a Spanish/English grey color poster and a matching worksheet to go along with it. I placed the sheets within my daughters Spanish Binder to be used as a review throughout our Spanish unit. By placing it within a binder sheet my daughter is able redo the matching activity as often as she likes.
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Above books are helpful books when guiding young learner through colors in Spanish.