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Answer: one and five tenths
1.5 is read as "one and five tenths." Read the whole number part first: 1 is "one." Say "and" for the decimal point. Then read the tenths part: 5 in the tenths place is "five tenths." Together: one and five tenths. Students often ignore the decimal point and read 1.5 as "fifteen."
3A rectangle is covered completely with same-size square tiles. There are 2 rows with 4 tiles in each row. How many tiles cover the rectangle?
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Answer: 8 tiles
The rectangle is covered by 8 square tiles. Count by rows: each row has 4 tiles, and there are 2 rows. Skip-count by 4: 4, 8. The total is 8 tiles. Students often add the number of rows and the tiles per row (2 + 4 = 6) instead of counting the total tiles in all rows.
4Which shape is a triangle?
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Answer: A shape with 3 straight sides and 3 corners
A triangle is defined as a shape with 3 straight sides and 3 corners. Compare each description to known shapes: 4 equal sides describes a square, no corners describes a circle, 6 sides describes a hexagon. Only 3 sides and 3 corners describes a triangle. Students may pick the square description because they associate 'shape' first with squares.
5Lily used 2 cups of flour for one batch of cookies and 3 cups of flour for a second batch. How many total cups of flour did she use?
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Answer: 5 cups
2 cups plus 3 cups equals 5 cups. Add the two amounts of flour: 2 + 3 = 5 cups. Students may miscount and add incorrectly to get 4 or 6 cups.
6Which symbol makes this statement true? 0.5 ___ 0.3
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Answer: >
0.5 is greater than 0.3, so the symbol > makes the statement true. Both numbers have 0 ones, so compare the tenths digits. 5 tenths is more than 3 tenths, because 5 is greater than 3. Therefore 0.5 > 0.3. Students may pick < because they mix up the direction of the comparison symbols.
7Lily has 3 dimes and 2 nickels. She spends 15 cents on a sticker. How much money does she have left?
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Answer: 25 cents
Lily has 25 cents left. 3 dimes = 30 cents and 2 nickels = 10 cents, so she starts with 30 + 10 = 40 cents. After spending 15 cents: 40 - 15 = 25 cents. Students may miscount the coins as 40 cents but forget to subtract the 15 cents spent, or value nickels and dimes incorrectly.
8Which two fractions represent the same amount of a shaded whole?
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Answer: 2/4 and 1/2
2/4 and 1/2 are equivalent fractions. 2/4 simplifies to 1/2 because 2 out of 4 equal parts covers the same amount as 1 out of 2 equal parts. Choosing pairs with matching numerators or denominators instead of checking the actual amount represented.
9A class had 24 crayons. Students used 9 crayons, and then the teacher added 5 new crayons to the box. How many crayons are in the box now?
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Answer: 20
There are 20 crayons in the box now. First subtract the used crayons: 24 - 9 = 15. Then add the new crayons: 15 + 5 = 20. The box now holds 20 crayons. Students may add all three numbers (24 + 9 + 5 = 38), ignoring that 9 crayons were used and should be subtracted.
10Deshawn goes to sleep at night at 8:00. Which is the correct way to write this time?
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Answer: 8:00 p.m.
Bedtime at night falls in the p.m. hours, so 8:00 p.m. is correct. Nighttime hours after noon and before midnight are labeled p.m. Since Deshawn goes to sleep at night, the time is written 8:00 p.m. Students may pick 8:00 a.m. by matching only the digits, or choose 'midnight' because the event happens at night, not realizing midnight names only 12:00.