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

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

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 = ?

This lesson will soon be taken down.

Subtract multiples of ten from 2-digit numbers

Lesson outcome