Selena is building a wall for her garden using 12 cement blocks.
If each cement block weighs 2.31 kilograms, how much will the wall weigh?

Question

Quizplus · Accepted Answer

We can solve this problem by multiplying the weight of each cement block (2.31) by the number of blocks in the wall (12).
Step 1: Set up long multiplication. Ignore the decimals for now (we deal with those later when we multiply).
 11ec0fda_98da_8f29_a67f_d9052286aeb1_NR0004_00 Step 2: We begin multiplying these two numbers by multiplying each digit of the top number by the number in the ones place of the bottom number. First, 2 x 1 = 1.
 11ec0fda_98da_8f2a_a67f_2181c2ad2b97_NR0004_00 Step 3: Next, 2 x 3 = 6.
 11ec0fda_98da_8f2b_a67f_01b43fb190dc_NR0004_00 Step 4: Finally, 2 x 2 = 4.
 11ec0fda_98da_8f2c_a67f_493ec36aabab_NR0004_00 Step 5: Now we move on to multiply each digit of the top number by the number in the tens place of the bottom number. We start a new row for this. Start by placing a zero in the ones place, since we are now multiplying by the tens place. First, 1 x 1 = 1.
 11ec0fda_98da_8f2d_a67f_694ddb8a211c_NR0004_00 Step 6: Next, 1 x 3 = 3.
 11ec0fda_98da_8f2e_a67f_ab91c814de24_NR0004_00 Step 7: Finally, 1 x 2 = 2.
 11ec0fda_98da_8f2f_a67f_cfbfce2139ce_NR0004_00 Step 8: Now, we add the two products (rows) to get the final result.
 11ec0fda_98da_8f30_a67f_19e7cbad7041_NR0004_00 Step 9: To place the decimal, count the number of digits to the right of the decimal in the problem. The total of those digits is how many spaces should come after the decimal in your answer.
 11ec0fda_98da_8f31_a67f_f1d73ce377bc_NR0004_00

Selena Is Building a Wall for Her Garden Using 12