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150 multiple-choice questions, 60 flashcards and 10 scenario simulations, written to the Common Core State Standards blueprint. Every question carries a full rationale.
Study 4th Math: Measurement & Data in CoStudy →
Common Core State Standards (CCSS) — Mathematics, Grade 4: Measurement & Data (4.MD.A.1-3, 4.MD.B.4, 4.MD.C.5-7). Public standards from corestandards.org.
CoStudy's 4th Math: Measurement & Data bank holds 220 items. Every multiple-choice question carries a written rationale explaining why the correct answer is correct and why each distractor is tempting but wrong, and the bank includes 10 scenario-based simulations.
A sample of 12 multiple-choice questions from the bank, with the full rationale shown.
To find perimeter, you:
Answer: B — Add all side lengths
B) Correct. A) area. C/D) wrong.
Perimeter of a rectangle with l=8, w=3?
Answer: B — 22
P = 2(l+w) = 2(8+3) = 22. (A) adds; (C) is area; (D) wrong.
A straight angle measures:
Answer: A — 180°
A) Correct. B) right. C) full. D) other.
Perimeter of 15 × 10 garden?
Answer: D — 50 ft
D) Correct — 2(15+10). B) area. C/A) miscount.
A 25 × 10 pool. Fence needed?
Answer: D — 70 ft
D) Correct — perimeter 2(25+10). B) area. C) sum. A) miscount.
A quarter turn is:
Answer: C — 90°
C) Correct — 360÷4. B/C/D) wrong.
3 meters = ___ centimeters.
Answer: B — 300
1 m = 100 cm; 3 × 100 = 300. (A),(C),(D) wrong.
Perimeter of 8 × 5 rectangle?
Answer: D — 26
D) Correct — 2(8+5). B) area. C) half. A) miscount.
How many squares of 1 unit tile a 6×4 rectangle?
Answer: D — 24
D) Correct — area. B) miscount. C) sum. A) miscount.
3 dimes + 4 nickels = ?
Answer: D — $0.50
D) Correct — 30+20=50 cents. B/C/A) miscount.
How many mL in half a liter?
Answer: A — 500
A) Correct. B/C/D) wrong.
An obtuse angle is:
Answer: A — Between 90° and 180°
A) Correct. B) acute. C) right. D) straight.
6 sample cards from the 60 in the bank.
What is an 'obtuse angle'?
An angle measuring more than 90° but less than 180°.
What is the area formula for a rectangle?
A = length × width.
A rectangle has area 48 sq ft and length 8 ft. What's the width?
6 ft. (48 ÷ 8 = 6.)
Convert 2 gallons to quarts.
8 quarts.
How many pounds in 1 ton?
2,000.
What unit is used to measure angles?
Degrees (°).
These samples are a small slice. The full bank runs flashcards, multiple choice and timed mock exams with per-chapter progress tracking, on the web and in the iOS app.
Open 4th Math: Measurement & Data →
The 4th Math: Measurement & Data bank holds 220 items: 150 multiple-choice questions, 60 flashcards and 10 scenario-based simulations. 18 of them are on this page to read free, with no signup.
Yes. Every multiple-choice item carries a written rationale that states the controlling principle behind the correct answer and then addresses each wrong option in turn — why it tempts and precisely where it fails. Knowing why the plausible answer was wrong is worth more than knowing which letter was right.
Common Core State Standards (CCSS) — Mathematics, Grade 4: Measurement & Data (4.MD.A.1-3, 4.MD.B.4, 4.MD.C.5-7). Public standards from corestandards.org.
The samples on this page are free to read in full, rationales included, with no account. The complete 220-item bank, the timed mock exams and per-chapter progress tracking are part of CoStudy on the web and in the iOS app.
Last reviewed 2026-08-22. Banks are written against the certifying body's published exam outline and re-checked when that outline changes — exams get renumbered, retired and reweighted, and a bank written to a superseded outline teaches the wrong proportions. Figures that are re-indexed annually are deliberately not asserted as rules; the questions test the governing principle instead.