A way to represent a problem involving parts and whole.

Use place value knowledge to write addition and subtraction equations

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

Complete the sentence.  Part + part = {{ }}.

In a bar model, to find the whole we add the {{ }}.

Use this bar model.  Which subtraction calculations are correct?

Sophie rolled a ball that rolled for 100 centimetres.  Jacob's ball rolled 40 centimetres further.  How many centimetres did Jacob's ball roll? {{ }} cm.

Express this representation as a number of tens.  {{ }} tens

Match the number of tens to the correct 3-digit number.

Which equation would make this statement correct?  140 < {{ }} 

What number is missing from the bar model?

Sort the values from largest to smallest.

This lesson will soon be taken down.

Use place value knowledge to write addition and subtraction equations

Lesson outcome