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hey there today weamp;#39;ll practice finding the unknown number in an addition or subtraction equation as previously discussed addition and subtraction are related letamp;#39;s look at this equation seven plus five equals twelve the three numbers in this equation seven five and twelve are part of a fact family we can create another addition sentence from these numbers which is five plus seven equals twelve we can also create to subtraction sentences which are twelve minus 7 equals five and 12 minus 5 equals seven by remembering how fact families work we can find unknown numbers in an addition or subtraction equation letamp;#39;s practice with an addition equation first 3 plus what unknown number equals ten you have any idea how to find the unknown number well we can subtract three from ten to find out ten minus three is equal to seven that means that unknown number is seven we can cross check this by adding three and seven since three plus seven equals ten weamp;#39;ve got
