An equation is used to show that one number, calculation or expression is equal to another.

An adjustment is a change to a number using either subtraction or addition.

The whole is all the parts or everything, the total amount.

A part is a piece or section of the whole.

Solve addition calculations mentally by using known facts

Maths

In this unit pupils used the concept of same sum to simplify and solve addition problems. In the future unit pupils will solve calculations with missing addends and use the same difference rule to balance equations. They will explain how increasing or decreasing the minuend affects the difference.

In the prior unit pupils identified structures within stories using their knowledge of structures to create stories. They used their knowledge of additive structures to solve problems. In this unit pupils used the concept of same sum to simplify and solve addition problems

Use equivalence and compensation to simplify and solve addition calculations

That one number, calculation or expression is equal to another.

What known fact is most helpful in completing the following calculation in your head? 134 + 5 = 139

Find the missing number mentally (use jottings if needed).
{{ }} = 67.24 + 0.76

Find the missing number mentally (use jottings if needed).
15.65 + 0.34 = {{ }}

Find the missing number mentally (use jottings if needed).
68,000 + 232,000 = {{ }}

Find the missing number mentally (use jottings if needed). {{ }} = 456,000 + 31,000

What is the missing number in this part-whole model?

In digits, write the number being represented by the place value counters.

What is the unknown in this equation?
435,000 + {{ }} = 425,000 + 16,000

Starter Quiz