Plank PacerTally Crew · numbers, fractions, measurement and shapes

Paces forward and back along a plank: adding and subtracting integers on the number line.

Add and Subtract Integers

Adding and subtracting integers on the number line. In MathBound, the free Algebra I adventure game, Plank Pacer asks these problems, and the only way past is to solve them.

Part of Expressions and Real Numbers: chapter 1 of the standard course.

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10 questions, no sign-up, nothing saved. Climbs from the basics to harder questions.

What you will practice

Opposites. Find the opposite of a positive integer.
Absolute Value. Find the absolute value of a single integer.
Add Integers. Add two integers with the same sign.
Subtract Integers. Subtract two positive integers (resulting in a negative).
Translate and Solve. Translate a basic phrase to an expression with integers.

Worked examples

Made by the game’s own question engine. Try each one, then open its steps.

Example 1 · Opposites

What

number

added

to

19

gives

0 ?

$- 19$
$- 38$
$0$
$19$

Show the worked steps

$A$ $number$ $plus$ $its$ $opposite$ $is$ $0.$
$19 + (- 19) = 0,$ $so$ $the$ $number$ $is$ $- 19 .$

Answer: $- 19$

Example 2 · Absolute Value

Which

number

has

the

greatest

absolute

value?

$5$
$10$
$17$
$- 18$

Show the worked steps

$Compare$ $distances$ $from$ $zero,$ $ignoring$ $the$ $signs.$
$∣ - 18∣ = 18$ $is$ $the$ $greatest$ $distance,$ $so$ $the$ $answer$ $is$ $- 18 .$

Answer: $- 18$

Example 3 · Add Integers

Sam

says

- 25 + (- 10) = - 15 .

What

is

the

correct

sum?

$35$
$- 15$
$15$
$- 35$

Show the worked steps

$Sam$ $subtracted$ $the$ $sizes,$ $but$ $the$ $signs$ $are$ $the$ $same.$
$Same$ $signs:$ $add$ $25 + 10 = 35$ $and$ $keep$ $the$ $negative:$ $- 35 .$

Answer: $- 35$

Where it is in your textbook

Textbook	Lessons
Standard course	1.3, 2.4
Big Ideas Math Algebra 1	1.4
Big Ideas Math Algebra 1 (2022)	1.6
CPM Core Connections Algebra	1.1.1
Glencoe Algebra 1	0-3, 2-5
Holt McDougal Larson Algebra 1	5.5
Illustrative Mathematics Algebra 1	4.13-4.14
Illustrative Mathematics Algebra 1 (v.360)	5.13-5.14
Math Nation Algebra 1 (Florida B.E.S.T.)	10.3
OpenStax Elementary Algebra 2e	1.3
Pearson Algebra 1 Common Core	1-5
Reveal Algebra 1	1-5, 2-5

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