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

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1
Evaluate 2.7 × n + 0.9 when n = 9.
Warm-up
Answer:
2
Evaluate 2.6 × n + 1.4 when n = 4.
Warm-up
Answer:
3
Evaluate 1.4 × n + 2 when n = 7.
Warm-up
Answer:
4
Evaluate 2.7 × n − 9.5 when n = 4.
On level
Answer:
5
Evaluate 2.8 × n − 10.4 when n = 5.
On level
Answer:
6
Evaluate 2.7 × n − 3.9 when n = 7.
On level
Answer:
7
Evaluate 2.2 × a + 1.3 × b when a = 6 and b = 2.
Challenge
Answer:
8
Evaluate 2.5 × a + 1.2 × b when a = 2 and b = 5.
Challenge
Answer:
9
Evaluate 1.8 × a + 2.2 × b when a = 2 and b = 5.
Challenge
Answer:

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Worksheet code: eyJzIjoiYWxnZWJyYS1ldmFsdWF0ZS1leHByLWRlY2ltYWwiLCJkIjpbMTY1NTI2MjY0MiwyNDc5MTIzMzEsMTI0NjQzOTc1NSw2MjgwMzExNzEsOTgyMDUxNDEsODYyOTk4NTY3LDExMTc3Njc5MTEsMTgzMjU2MjIzMiwxODczNjc4OTc1XSwidiI6MX0.9bb8c345bfa6

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Answer key · Evaluate algebraic expressions involving decimal numbers

1.
25.2 — 2.7 × 9 = 24.3, then + 0.9 = 25.2.
2.
11.8 — 2.6 × 4 = 10.4, then + 1.4 = 11.8.
3.
11.8 — 1.4 × 7 = 9.8, then + 2 = 11.8.
4.
1.3 — 2.7 × 4 = 10.8, then − 9.5 = 1.3.
5.
3.6 — 2.8 × 5 = 14, then − 10.4 = 3.6.
6.
15 — 2.7 × 7 = 18.9, then − 3.9 = 15.
7.
15.8 — 2.2 × 6 = 13.2 and 1.3 × 2 = 2.6, so the sum is 15.8.
8.
11 — 2.5 × 2 = 5 and 1.2 × 5 = 6, so the sum is 11.
9.
14.6 — 1.8 × 2 = 3.6 and 2.2 × 5 = 11, so the sum is 14.6.