This week in Willow, we have been using formal written methods to add and subtract. To begin, we discussed the base ten system, which allowed us to understand the idea of regrouping. To reinforce this conceptual understanding, we used place value counters to regroup in a game of 'what number am I? before moving on to using column method.
Yesterday, we focused solely on subtracting; using our place value counters, representing the equation pictorially and showing this using column method. We also examined a few of Gertrude's silly mistakes and, drawing upon our mathematical reasoning, explained where she had gone wrong, particularly with exchanging and regrouping.
The lovely Ronnie Gayle deserves a special shout out. Originally, he fell into Gertrude's trap of silly mistakes. Today he was particularly resilient and resourceful and is now a master of column method!
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