Join

Result unknown

Alex has 7 stickers.  Betty gives him 5 more. How many stickers does Alex have now?

Change unknown

Alex has 7 stickers.  Betty gives him some more.  Now he has 12 stickers.  How many stickers did Betty give to Alex?

Beginning unknown

Alex has some stickers.  Betty gives him 5 more.  Now, he has 12 stickers. How many stickers did Alex have at first?

Separate

Result unknown

Kelly has 12 stickers .  She gives Ben 5 stickers.  How many stickers does Kelly have left?

Change unknown

Kelly has 12 stickers.  She gives some to Ben.  Now, she has 7 stickers left.  How many stickers did she give to Ben?

Beginning unknown

Kelly has some stickers.  She gives Ben 5 stickers. Now she has 7 stickers left.  How many stickers did Kelly have at first?

Part-part-whole

Whole unknown

Martin has 5 green marbles and 7 blue marbles.  How many marbles does he have in all?

Part unknown

Martin has 12 marbles.  5 of the marbles are green and the rest are blue.  How many blue marbles does he have?

Compare

Difference unknown

Peter has 5 marbles.  Tom has 12 marbles.  How many more marbles does Tom have than Peter?

Larger set unknown

Peter has 5 marbles.  Tom has 7 more than Peter.  How many marbles does Tom have?

Smaller set unknown

Tom has 12 marbles.  He has 7 more than Peter.  How many marbles does Peter have?