Year 3 Autumn Term: Block 2 Addition and Subtraction

Using bar models to help with adding multiples of 100.

Adding multiples of 100 up to 1 000.

Add a single digit to a 3-digit number with base 10 blocks, not crossing the tens boundary.

Add mentally a single digit to a 3-digit number.

Add a multiple of 10 to a 3-digit number with a bar model, not crossing 100.

Add a multiple of 10 to a 3-digit number with a bar model, crossing 100.

Add two 3-digit numbers not crossing ten or hundred with bar models.

Add two 3-digit numbers not crossing ten or hundred.

Using bar models to help with subtracting multiples of 100.

Using base 10 blocks to help with subtracting multiples of 100.

Using base 10 blocks to help with subtracting a single digit from a 3-digit number.

Subtracting a single digit from a 3-digit number.

Subtracting a multiple of 10 from a 3-digit number, with bar models. Exchange from hundreds to tens needed.

Subtracting a multiple of 10 from a 3-digit number, with bar models. No crossing of hundreds needed.

Subtracting a multiple of 10 from a 3-digit number, with base 10 blocks. Exchange from hundreds to tens needed.

Subtracting a multiple of 10 from a 3-digit number. Exchange from hundreds to tens needed.

Today we are going to look at a quick way that you can add 99 to a 3-digit number.

Today we are going to look at a quick way that you can subtract 99 from a 3-digit number.

Number bonds to 1,000 with the help of counters.

Using part-whole models for number bonds of 1,000.

Number bonds to 1,000 with the help of bar model.

Adding and subtracting a 1-digit number from a 3-digit number with the help of place value grids.

Adding whole hundreds with visual help.

Knowing pairs of numbers that make 10 will make these pages easy: pairs of multiples of 100 that total 1000.

Adding multiples of 100, often crossing the thousands boundary.

Some straightforward adding to hundreds. These give confidence with using larger numbers.

Adding 9 or 11 to 3-digit numbers by adding 10 and adjusting.

Subtract 9 from 3-digit numbers.

Adding hundreds and tens with visual help.

More addition of whole hundreds and tens with visual help.

Use bar models to add and subtract.

Bar Model: addition and subtraction facts.

Use bar models to help with subtraction by counting on.

Count back in tens from 3-digit numbers.

Using digit cards to make and add two 3-digit numbers.

Maths is all about patterns. Here we have an addition table with interesting diagonal patterns as well as seeing patterns in addition number sentences.

Add whole hundreds to 3-digit numbers mentally.

Speedy addition and subtraction of 100 from 3-digit numbers.

Using addition and subtraction to solve word problems.

Use addition and subtraction to solve word problems.

Today we are looking at the formal, written method of addition for adding two, 2-digit numbers.

Today we are looking at the formal, written method of addition for adding a 2-digit number to a 3-digit number.

Today we are looking at the formal, written method of addition for adding two 3-digit numbers.

Today we will look at the written method of subtraction, subtracting a 2-digit number from a 3-digit number including having to make an exchange.

Today we will look at the written method of subtraction.

Adding multiples of ten to three digit numbers using the standard written method.

Adding a 2-digit number to a 3-digit number using the standard written method.

Subtracting multiples of 10 from 3-digit numbers.

Subtract whole tens from 3-digit numbers using written methods.

Simple practice using the written method to add hundreds to 3-digit numbers.

Subtract whole hundreds from 3-digit numbers using written methods.

Using the formal written method to add two 3-digit numbers.

Missing digits for addition of 3-digit numbers.

Written subtraction using 3-digit numbers; easier examples.

Being able to check calculations quickly and efficiently is an important part of calculating.