Comparing and Ordering Decimals — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. On a number line from 0 to 1 with marks every 0.1, what decimal sits at the 7th mark from 0?
A) 0.07
B) 0.7
C) 0.77
D) 7.0
Seven marks past 0 at 0.1 each equals 0.7 in ascending sequence.
2. A number line from 2 to 3 has marks every 0.05. What value is at the 4th mark past 2?
A) 2.04
B) 2.2
C) 2.20
D) 2.4
2 plus 0.20 equals 2.2 in ascending magnitude on the Grade 5 number line.
3. Between 0.5 and 0.6, a number line has marks every 0.01. What value sits at the 3rd mark past 0.5?
A) 0.503
B) 0.53
C) 0.53 padded — equals 0.530
D) 0.6
0.5 plus 0.03 equals 0.53 in ascending order — three hundredths past 0.5.
4. On a number line from 1.2 to 1.3 marked in thousandths, what value sits 5 ticks past 1.2?
A) 1.205
B) 1.25
C) 1.5
D) 1.025
1.2 plus 0.005 equals 1.205 in ascending magnitude — five thousandths past 1.2.
Part B: Fill in the Blank
Write the correct answer on each line.
1. On a number line from 0 to 1 marked in tenths, the point halfway between 0.3 and 0.4 is 0.35.
(0.30 plus 0.40) divided by 2 equals 0.35 in Grade 5 magnitude.
2. A number line from 4 to 5 has marks every 0.25. The value at the 3rd mark past 4 is 4.75.
4 plus 0.75 equals 4.75 in ascending sequence.
3. If a number line from 0 to 0.1 is divided into 10 equal parts, each tick equals 0.01.
0.1 divided by 10 equals 0.01 — each hundredths tick on the Grade 5 number line.
4. Round 0.876 to the nearest tenth. The answer plotted on a number line is 0.9.
Grade 5 rounding: 7 hundredths rounds tenths up from 8 to 9 in ascending magnitude.
5. Between 0.99 and 1.00 on a number line marked in thousandths, the 5th tick past 0.99 is 0.995.
0.99 plus 0.005 equals 0.995 in ascending sequence — halfway to 1.00.