An addend means any of the numbers that are added together.

Bridging 100 means partitioning one addend to make a number bond to 100 then adding the remaining part.

Bridge 100 by adding in multiples of 10

Maths

Composition of 100 in 10s and 1s

Composition of 100 in 50s, 25s and 20s

Multiples of 10 that total 100

Use known facts to find pairs of numbers that total 100

Use known facts to find complements to 100 efficiently

Represent 3-digit multiples of 10 in different ways

Use place value knowledge to write addition and subtraction equations

Bridge 100 by subtracting in multiples of 10

Solve problems using knowledge of addition and subtraction of multiples of 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.  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.

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. They will add and subtract multiples of ten, bridging 100.

Securing place value to 100 and applying to addition and subtraction

What are the addends in this calculation 90 + 30 = 120 ?

If I know 6 + 5 = 11 what is 6 tens + 5 tens? {{ }}

When adding 80 to 60, how can the addend 60 be partitioned to bridge 100?

Which addition is equivalent to 80 + 20 + 50?

 A number has been partitioned into something and 40 to bridge 100. What is the missing addend?  70 + {{ }} + 50 = 150

What is the missing part on the bar model?

What is the missing whole on the bar model?

Use this bar model. Which addition calculations are correct?

 170 = 40 + 100 + {{ }}.  What is the missing part?

Sofia buys some ribbon that is 170 cm long. She gives 70 cm to her friend. How much does she have left ? {{ }} cm.

Which calculations could represent this bar model?

Bridge 100 by adding in multiples of 10

Lesson outcome