Use the number line, to help you find the value of $19+343$19+343.
$19+343$19+343 $=$= $\editable{}$
Use the number line to help you find the value of $21+242$21+242.
Find the value of $142+311$142+311.
Find the value of $222+311$222+311.
uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers