The number that is to be subtracted. The second number in a subtraction.

The first number in a subtraction. The number from which another number is to be subtracted.

Bridge 100 by subtracting in multiples of 10

Maths

In this unit pupils will use known facts to find multiples of ten that compose 100  and use known facts to find complements to 100.  In the future unit pupils will find a 2-digit number and a 1 or 2-digit number that compose 100. Pupils will position 3-digit numbers on a number line and estimate the position of 3-digit numbers on unmarked number lines. They will compare and order 3 digit numbers.

In the prior unit pupils reviewed and secured previous knowledge of add 3 addends, understanding they can be added in any order, bridging through 10. In this unit pupils will use known facts to find multiples of ten that compose 100  and use known facts to find complements to 100.

Securing place value to 100 and applying to addition and subtraction

Which number is the subtrahend in this calculation? 150 - 70 = 80 

Which number is the minuend in this calculation? 130 − 50 = 8 tens

Match the known number fact to its related multiple of ten.

Which partitioned subtrahend will help you to bridge 100?

How would the subtrahend 70 be partitioned in this equation?

What is the missing value? 8 tens + {{ }} tens = 13 tens.

What are the addends in this calculation: 90 + 30 + 10 = 130

If I know 6 + 7 = 13, what is 6 tens + 7 tens? {{ }}

Match the linked equations. Which number facts would you use to solve each equation with multiples of 10? 

 What is the sum of these addends 40 + 60 + 50 = {{ }}

 What is the missing addend 80 + {{ }}  + 40 = 140?

This lesson will soon be taken down.

Bridge 100 by subtracting in multiples of 10

Lesson outcome