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Evaluate algebraic expressions involving decimal numbers · Grade 7 · C2.2

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1
Evaluate 2.8 × n + 2.3 when n = 9.
Warm-up
Answer:
2
Evaluate 1.1 × n + 2.9 when n = 4.
Warm-up
Answer:
3
Evaluate 1.2 × n + 0.9 when n = 8.
Warm-up
Answer:
4
Evaluate 2.3 × n − 9.4 when n = 9.
On level
Answer:
5
Evaluate 2.1 × n − 6.2 when n = 3.
On level
Answer:
6
Evaluate 1.5 × n − 8.1 when n = 9.
On level
Answer:
7
Evaluate 1.5 × a + 1.5 × b when a = 3 and b = 5.
Challenge
Answer:
8
Evaluate 2.1 × a + 1.2 × b when a = 4 and b = 2.
Challenge
Answer:
9
Evaluate 1.9 × a + 2.1 × b when a = 3 and b = 6.
Challenge
Answer:

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Worksheet code: eyJzIjoiYWxnZWJyYS1ldmFsdWF0ZS1leHByLWRlY2ltYWwiLCJkIjpbMzIxODA5Mzc3LDEwNzMzNTEyMjcsMTU2NDUwNTgyNiwxNDM5NTk5NDcwLDIwMTc1MjM5MzYsNTkyNDcyMDkzLDEyNTk2ODQ2MzksMTc1Njg5MDg4MSw2MDM3Mjc4NzJdLCJ2IjoxfQ.c6a9526eef12

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Answer key · Evaluate algebraic expressions involving decimal numbers

1.
27.5 — 2.8 × 9 = 25.2, then + 2.3 = 27.5.
2.
7.3 — 1.1 × 4 = 4.4, then + 2.9 = 7.3.
3.
10.5 — 1.2 × 8 = 9.6, then + 0.9 = 10.5.
4.
11.3 — 2.3 × 9 = 20.7, then − 9.4 = 11.3.
5.
0.1 — 2.1 × 3 = 6.3, then − 6.2 = 0.1.
6.
5.4 — 1.5 × 9 = 13.5, then − 8.1 = 5.4.
7.
12 — 1.5 × 3 = 4.5 and 1.5 × 5 = 7.5, so the sum is 12.
8.
10.8 — 2.1 × 4 = 8.4 and 1.2 × 2 = 2.4, so the sum is 10.8.
9.
18.3 — 1.9 × 3 = 5.7 and 2.1 × 6 = 12.6, so the sum is 18.3.