Use properties and mental math to solve. 7.35+ 1.47+ 9.65=

Hello mate!

We have the equation 7.35+ 1.47+ 9.65

We can see that 35 + 65 = 100, so we could do this:

7.35+ 1.47+ 9.65 = (7.35+ 9.65) + 1.47 = (7 + 0.35+ 9 + 0.65) + 1.47 = (7 + 9 + (0.35 + 0.65)) + 1.47 = (7 + 9 + 1) + 1.47 = 17 + 1.47 = 18.47

Is always useful to look for numbers that "fit" and add them first.

With "fit" i mean that the numbers add to 1, 10 or something that is easier to handle.

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation: