Teaching Presentation: Written subtraction (Year 4 Addition and Subtraction)

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

• Written subtraction

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
Write 654 – 321 on the board. How would we work this out? Draw out partitioning into 100s, 10s and 1s. Record an expanded column subtraction and model each stage of the process. Repeat with 651 – 324 and 742 – 328. Children work in pairs to work out 445 – 339.

Day 2 Teaching
Display Top Marks ‘Decomposition’ on the Interactive Whiteboard. Show 657 – 432. Ask children how to work this out, then click on the ‘partition’ arrow to split into 100s, 10s and 1s. Work through then repeat with 657 – 472, 465 – 283, 625 – 362, 936 – 571.

Day 3 Teaching
Use 460 – 238 and 734 – 351 to revise how to move from 100s to 10s or from 10s to 1s. Introduce 966 – 177 and repeat with 842 – 467 (two moves needed).

Day 4 Teaching
Show a glass of squash. It has 533ml of squash. Pour some out (251 ml). Children estimate how much is left. Discuss strategies for estimating. Then use expanded decomposition to work out the answer and compare this to estimates. Repeat with other amounts.

Day 5 Teaching
Share 802 – 374. Model using expanded decomposition. Ask if children can think of an easier method. Discuss Maths Frog and model using this. Repeat for 904 – 785, comparing methods.

This teaching is part of Hamilton’s Year 4 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.