Use what you know about the properties to rewite each number sentence. use mental math to find the sum. 0.6 + (0.4 + 0.9) = n and (1.57 + 0.75) + 0.25 + n

First Equation:

0.6 +(0.4+0.9) =n

Step 1: do parentheses first:  

0.4+0.9 = 1.3

Step 2: Add 0.6 + 1.3

0.6 + 1.3 = 1.9

n= 1.9

Second Equation:

(1.57 + 0.75) + 0.25 + n

Step 1: do parentheses first:

1.57 + 0.75 = 2.50

Step 2: Add 2.50 + 0.25 = 2.75

Step 3: Add 2.75 and n = 2.75+n

Final

1.9 +2.75+n = 4.65 +n

Hope this helps!!

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step-by-step explanation:

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step-by-step explanation: