Problem
circle x circle = 36, and the only one-digit number that times itself makes 36 is 6.
Only 6 among one-digit numbers squares to 36, so circle = 6.
3.OA.A.4Eliminate PossibilitiesThe circle stands for the number 6.
The circle multiplied by itself equals 36, and among the single-digit numbers only 6 does that.
Six equal groups of six add up to 36, so 6 times 6 really makes 36.
Multiplying every other single-digit number by itself and comparing the totals, none but 6 reaches exactly 36.
triangle x circle = 48 and circle = 6, so triangle x 6 = 48, giving triangle = 8.
The missing factor of 48 with 6 is 8, a basic division fact.
3.OA.A.4Eliminate PossibilitiesSince triangle = 8, '1 triangle' is 18, so square x 2 = 18 gives square = 9; the distinct shapes 6, 8, 9 sum to 23.
Doubling to reach 18 needs 9, and adding the three found values gives the total.
3.OA.D.8Guess And CheckStart with the shape you can pin down, then unlock the rest in order -- just Grade 3 multiplication facts!