12 + 12 + 12 = 40 + 40 + 40 = 60 + 60 + 60 + 60 = 10 + 20 + 40 + 80 = 100 − 50 − 30 = 100 − (50 − 30) = 500…

Question

12 + 12 + 12 = 40 + 40 + 40 = 60 + 60 + 60 + 60 = 10 + 20 + 40 + 80 = 100 − 50 − 30 = 100 − (50 − 30) = 500 − (130 − 80) =

ScanSolve AI Tutor · Accepted Answer

Here are the solutions to the mental maths problems. a) Step 1: Add the numbers. 12 + 12 + 12 = 36 The answer is 36. b) Step 1: Add the numbers. 40 + 40 + 40 = 120 The answer is 120. c) Step 1: Add the numbers. 60 + 60 + 60 + 60 = 240 The answer is 240. d) Step 1: Add the numbers sequentially. 10 + 20 = 30 Step 2: Continue adding. 30 + 40 = 70 Step 3: Complete the addition. 70 + 80 = 150 The answer is 150. e) Step 1: Perform the subtractions from left to right. 100 − 50 = 50 Step 2: Complete the subtraction. 50 − 30 = 20 The answer is 20. f) Step 1: Solve the expression inside the parentheses first. 50 − 30 = 20 Step 2: Perform the subtraction. 100 − 20 = 80 The answer is 80. g) Step 1: Solve the expression inside the parentheses first. 130 − 80 = 50 Step 2: Perform the subtraction. 500 − 50 = 450 The answer is 450.

12 + 12 + 12 = 40 + 40 + 40 = 60 + 60 + 60 + 60 = 10 + 20 + 40 + 80 = 100 - 50 - 30 = 100 - (50 - 30) = 500 - (130 - 80) =

Answers

Step-by-step solution

Part a· 1 step

Add the numbers.

Part b· 1 step120

Add the numbers.

Part c· 1 step240

Add the numbers.

Part d· 3 steps150

Add the numbers sequentially.

Continue adding.

Complete the addition.

Part e· 2 steps20

Perform the subtractions from left to right.

Complete the subtraction.

Part f· 2 steps80

Solve the expression inside the parentheses first.

Perform the subtraction.

Part g· 2 steps450

Solve the expression inside the parentheses first.

Perform the subtraction.

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