To split a whole up into parts; a piece or section of a whole.

Add 2-digit numbers when crossing the tens boundary

Maths

In this unit pupils apply their knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers both within and across the tens boundary. In the future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

In the prior unit pupils added and subtracted 1s and 10s from 2 digit numbers. They used number facts to add/subtract a single-digit number to/from a 2-digit number and used a part-part-whole model to represent addition and subtraction. In this unit pupils apply knowledge of known facts and understanding of place value to add and subtract with 2-digit numbers within and across the tens boundary.

Addition and subtraction of two 2-digit numbers

Partition both addends to solve the equation. 57 + 34 = {{ }}

Which equation is represented by this number line?

Which of the following is the missing addend? 35 + {{   }} = 71

Find the missing addend. 38 + {{   }} = 63

Which of the following is the missing addend?

Use the first equation to help solve the second equation.

Which of the following could be the ones digits in the equation?

One of the Base 10 blocks has been moved over from one addend to the other. Which of the following could show the new equation? Tick two.

Starter Quiz