Strategies to subtract from nos >100 - Teaching Presentation - Year 3

This presentation provides three days of teaching that cover the objectives:

• Subtract 2-digit numbers from 3-digit numbers using an efficient strategy

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
Show a toy Frog and discuss how Frog helps us subtract. Use Frog to do 162 – 135, modelling how to draw the steps on an empty number line. Write 471 – 425. Children use Maths Frog on whiteboards to work it out. Remind them that the ‘baby’ number goes on left hand side and Frog always hops to the next 10. Repeat with 893 – 838 and 673 – 606.

Day 2 Teaching
Children think, pair, share, how Frog helps us. Write 871 – 827. Children solve on whiteboards with Maths Frog. Ask children how we check it. Agree that we use addition, because the inverse of subtraction is addition – addition undoes subtraction: Repeat with 453 – 406 and 693 – 226.

Day 3
Remind children of expanded and compact addition and using Frog to subtract by counting up. Today we choose addition and subtraction to find the answers to word problems. Reveal word problems (see resources) 1 by 1. Model using the bar model for the first 2 questions.

This teaching is part of Hamilton’s Year 3 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.