Explain 15 − 8 mentally by using the terminologies.

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ScanSolve AI Tutor · Accepted Answer

Okay, let's tackle the questions under "3 Confirm". 1) Explain 15 − 8 mentally by using the terminologies. To subtract 15 − 8 mentally, we can use the strategy of making a ten. Step 1: Decompose the subtrahend 8 into two parts: one part that, when subtracted from the minuend 15, results in 10. 15 − 8 = 15 − (5 + 3) Step 2: Subtract 5 from 15 to reach 10. (15 − 5) − 3 = 10 − 3 Step 3: Subtract the remaining 3 from 10. 10 − 3 = 7 2) Explain 13 − 5 by 'Subtraction-addition method' and 'Subtraction-subtraction method'. a) Subtraction-addition method (also known as "counting up" or "think addition"): This method finds the difference by adding up from the subtrahend to the minuend. Step 1: Start with the subtrahend, 5. Add to reach the next friendly number, 10. 5 + 5 = 10 Step 2: From 10, add to reach the minuend, 13. 10 + 3 = 13 Step 3: The total amount added is the difference. 5 + 3 = 8; So, 13 − 5 = 8. b) Subtraction-subtraction method (also known as "take away to make a ten" or "decompose the subtrahend"): This method involves decomposing the subtrahend to subtract in parts, often by first subtracting to reach a ten. Step 1: Decompose the subtrahend 5 into two parts: one part that, when subtracted from the minuend 13, results in 10. 13 − 5 = 13 − (3 + 2) Step 2: Subtract 3 from 13 to reach 10. (13 − 3) − 2 = 10 − 2 Step 3: Subtract the remaining 2 from 10. 10 − 2 = 8; So, 13 − 5 = 8.

Explain 15 - 8 mentally by using the terminologies.

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Step-by-step solution

Part a· 3 steps

Start with the subtrahend, 5.

From 10, add to reach the minuend, 13.

The total amount added is the difference.

Part b· 3 steps8

Decompose the subtrahend 5 into two parts

Subtract 3 from 13 to reach 10.

Subtract the remaining 2 from 10.

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