This presentation provides two days of teaching that cover the objective:
- Mental calculation – complements to 100
It includes starter activities, whole class teaching, group activities, practice sheets and mastery questions. It can be used on a variety of interactive whiteboards.
Day 1 Teaching
Use the bead bar to demonstrate the pairs of multiples of 5 that total 100, e.g. 10 and 90, 15 and 85, etc. Record and rehearse these aloud.
Day 2 Teaching
Use the bead bar to demonstrate that we can count up from 67 to 70 and from 70 to 100. So 67 + 33 = 100. Hide the complement of 56 under a cloth on the bead bar and encourage children to work it out by performing the hops in their heads.
This teaching is part of Hamilton’s Year 3 Place Addition and Subtraction block. Each Hamilton maths block contains a complete set of planning and resources to teach a term’s worth of objectives for one of the National Curriculum for England’s maths areas.
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