The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.

To add the parts of a number gained through partitioning the whole to reach the whole again.

Subtract multiples of ten from 2-digit numbers

Maths

Add and subtract one to or from a two-digit number within a decade

Add and subtract 1 to and from a 2-digit number crossing the tens boundary

Use number facts to add or subtract a one-digit number and a two-digit number.

Use number facts to solve addition and subtraction problems.

Use number facts to solve problems in measures and data contexts

Use number bonds to 10 to add/subtract one-digit and two-digit numbers

Add by bridging a multiple of ten

Subtract by bridging a multiple of ten

Use bridging to solve addition and subtraction problems

Find 10 more or less than a 2-digit number.

Add and subtract 10 to and from a 2-digit number.

Add multiples of 10 to 2-digit numbers.

Partition 2-digit numbers in different ways

Use efficient strategies to solve problems

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

Look at the number line. What equation is it showing?

 86 − 50 = ?     How many tens are being subtracted from 86 in this equation? {{ }} tens

Which of the images represent this equation? 82 − 40 =

Match the known facts that will help to subtract multiples of 10

What could we do to help solve this equation? 75 − 30 =

19 + 40 = ?     How many tens is being added to 19 in this equation? {{ }} tens

Look at the image. Which equation does it represent?

Match the known facts that will help to add multiples of 10

What could we do to help solve this equation? 32 + 50 =

Which of these equations will have the same sum as 54 + 40 = ?

Subtract multiples of ten from 2-digit numbers

Lesson outcome