3. Your students have been working on expanded notation. One example you could give to your students would be:
ООО O
A) 34 = 3.4 x 10 + 1
B) 34 = 4 tens and 3 ones
C) 34 = 1 + 1 + 1 + 10 + 10
D) 34 = 10 + 10 + 10 + 1 + 1 + 1 + 1

The answer for this question is C

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

221,500 is the answer