Let’s find the value of $309+501$309+501, by partitioning the numbers.

a

Fill in the box with the missing number.

$309=300+\editable{}$309=300+

b

Fill in the box with the missing number.

$501=\editable{}+1$501=+1

c

Find the value of $309+501$309+501.

Easy

Approx a minute

Let’s find the value of $3005+6005$3005+6005, by partitioning the numbers.

Find the value of $550+150$550+150.

Find the value of $225+125$225+125.

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Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers and make estimates for these computations