Partition 2-digit numbers in different ways

Maths

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.

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

Match each number to the number of tens it is composed of. 

52 can be partitioned in different ways. Match the multiple of 10 with another number that sums to 52

Which equation will come next in the pattern?

Which of these equations show that 63 has been correctly partitioned into three parts? 

Which of these equations show that 47 has been correctly partitioned into three parts? 

What is the missing addend in this equation? 69 = 40 + 9 + {{ }}

79 − 40 = ?     How many tens is being subtracted from 79 in this equation? {{ }} tens

Look at the image. Which equation does it represent?

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

What could we do to help solve this equation? 72 − 40 =

Which of these equations will have the same sum as 37 + 50?

This lesson will soon be taken down.

Partition 2-digit numbers in different ways

Lesson outcome