Decade Spin [Composing Numbers]
Activity Type: Whole Group
Deriver +/- (Composing Numbers)
Present problems such as 70 + 3 and 20 + 7. Use the same strategy as above, placing 2 tens and then 7 ones out. If students need additional assistance, lay the ones out one at a time while counting by ones. Note the result (“27 … that means 2 tens and 7 ones”) and encourage students to solve another one faster way.