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Grade 3 Math Diagnostic — Answer Key

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1
B — 623
345 + 278 = 623.
2
444
700 − 256 = 444.
3
A — 42
6 × 7 = 42.
4
B — 7
56 ÷ 8 = 7.
5
B — 498
498 > 494 > 489 > 484.
6
370
67 rounds up, so 367 → 370.
7
B — 7
14 ÷ 2 = 7.
8
3/4
3 parts out of 4 = 3/4.
9
B — 6
A hexagon has 6 sides.
10
24 cm
6 + 6 + 6 + 6 = 24 cm.
11
B — 45
9 × 5 = 45.
12
9
36 ÷ 4 = 9.
13
B — 42
42 ends in 2, so it is even.
14
25
Add 5 each time: 20 + 5 = 25.
15
A — 60
1 hour = 60 minutes.
16
590
456 + 134 = 590.
17
B — 21
7 × 3 = 21.
18
6 apples
24 ÷ 4 = 6.
19
B — 1/2
1/2 is bigger than 1/3, 1/4 and 1/8.
20
424
803 − 379 = 424.
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