This tests root word meanings. The root word 'friend' means someone you like. When we add '-ly' it means acting like that. Friendly means acting like a friend or being kind.

This tests CCSS.L.2.4.c (using a known root word as a clue to the meaning of an unknown word with the same root). A root word (or base word) is the basic word that other related words are built from. When words share the same root, they have related meanings, and knowing the root helps you figure out the meaning of related words; for example, if you know 'care' means to give attention, you can figure out 'careful' (care + ful = full of care = paying attention). Common patterns include: root + -ful (full of: helpful, playful, colorful). Choice B is correct because it recognizes that 'care' is the root, meaning to give attention, and 'careful' contains this root plus '-ful,' so 'careful' means full of care, or paying attention; this shows understanding that words sharing the same root are related in meaning, and knowing the root provides a clue to the meaning of the longer word. Choice D shows confusing the suffix '-ful' (full of) with '-less' (without), a common mistake where second graders don't recognize how suffixes change the root's meaning to create opposites. To help students, teach common suffix meanings like -ful = full of, and model think-aloud: 'I see the word 'careful.' I know 'care' means attention. I see '-ful' which means full of. So 'careful' means full of attention.' Practice with word family sorts, grouping words by shared root like all 'care' words together.

This tests CCSS.L.2.4.c (using a known root word as a clue to the meaning of an unknown word with the same root). A root word (or base word) is the basic word that other related words are built from. When words share the same root, they have related meanings, and knowing the root helps you figure out the meaning of related words; for example, if you know 'help' means to assist, you can figure out 'helper' (help + er = one who helps). Common patterns include: root + -er (one who does: teacher, helper, player). Choice A is correct because it recognizes that 'help' is the root, meaning to assist, and 'helper' contains this root plus '-er,' so 'helper' means a person who helps; this shows understanding that words sharing the same root are related in meaning, and knowing the root provides a clue to the meaning of the longer word. Choice C shows confusing the suffix '-er' (one who does) with '-ful' (full of), a common mistake where second graders mix up suffix meanings. To help students, create word family charts showing root + various suffixes like HELP family (help, helper, helpful, helpless, helping), and practice root identification by showing a word like 'helper,' identifying the root 'help,' the suffix '-er,' and combining meanings 'one who assists.'

This tests CCSS.L.2.4.c (using a known root word as a clue to the meaning of an unknown word with the same root). A root word (or base word) is the basic word that other related words are built from. When words share the same root, they have related meanings, and knowing the root helps you figure out the meaning of related words; for example, if you know 'rain' means water from the sky, you can figure out 'rainy' (rain + y = having rain). Common patterns include: root + -y (having: rainy, sunny). Choice A is correct because it recognizes that 'rain' is the root, meaning water from the sky, and 'rainy' contains this root plus '-y,' so 'rainy' means having rain; this shows understanding that words sharing the same root are related in meaning, and knowing the root provides a clue to the meaning of the longer word. Choice C shows confusing the suffix '-y' (having) with '-less' (without), a common mistake where second graders don't see how the suffix adds to the root's meaning. To help students, teach the formula: ROOT meaning + SUFFIX meaning = NEW WORD meaning (rain (water from sky) + y (having) = rainy (having water from sky)); also, compare related words like 'How are 'rainy' and 'sunny' similar? Both use -y to mean having the root.'

This tests CCSS.L.2.4.c (using a known root word as a clue to the meaning of an unknown word with the same root). A root word (or base word) is the basic word that other related words are built from. When words share the same root, they have related meanings, and knowing the root helps you figure out the meaning of related words; for example, 'happy' means feeling glad, and 'happiness' (happy + ness = state of being happy) shares that meaning of gladness. Common patterns include: root + -ness (state of being: happiness, kindness). Choice A is correct because it recognizes that 'happy' is the root, meaning feeling glad, and 'happiness' contains this root plus '-ness,' so they share the meaning of feeling glad or good; this shows understanding that words sharing the same root are related in meaning, and knowing the root provides a clue to the meaning of the longer word. Choice C shows ignoring the root connection and confusing it with an opposite, a common mistake where second graders don't see that words with the same root have related meanings or overlook spelling changes like happy to happiness. To help students, teach common suffix meanings like -ness = state of being, and practice with word families like HAPPY family (happy, happiness, happily); compare related words: 'How are 'happy' and 'happiness' related? Both share the root meaning of gladness, but -ness means the state of it.'

This asks about root words. When we add 'y' to 'rain', it means having rain. A rainy day has lots of rain.

We're finding shared meaning in root words. Both 'color' and 'colorful' share the root 'color.' They both have to do with color - one names it, one describes having lots of it.

We're finding the root word. In 'playing,' the root word is 'play.' The 'ing' part is added to show it's happening now.

This asks about word endings. When we add 'ness' to 'happy', it means the state of being happy. Happiness is the feeling of being happy.

This tests word endings. When we add 'ly' to 'slow', it tells how something is done. Slowly means in a slow way.