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

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1
Evaluate 2.4 × n + 1.7 when n = 3.
Warm-up
Answer:
2
Evaluate 1.9 × n + 2.7 when n = 2.
Warm-up
Answer:
3
Evaluate 2.1 × n + 1.2 when n = 8.
Warm-up
Answer:
4
Evaluate 1.3 × n − 0.4 when n = 7.
On level
Answer:
5
Evaluate 2.1 × n − 6.2 when n = 9.
On level
Answer:
6
Evaluate 1.7 × n − 5.1 when n = 4.
On level
Answer:
7
Evaluate 2.1 × a + 1.7 × b when a = 2 and b = 6.
Challenge
Answer:
8
Evaluate 2.3 × a + 2.1 × b when a = 3 and b = 6.
Challenge
Answer:
9
Evaluate 2.1 × a + 2.4 × b when a = 6 and b = 6.
Challenge
Answer:

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Worksheet code: eyJzIjoiYWxnZWJyYS1ldmFsdWF0ZS1leHByLWRlY2ltYWwiLCJkIjpbMTQyNTMyNzIwOSwxNzk1OTg3NjYzLDE4MTc0MzkxNDIsNzQxNzQ0OTgyLDE2MTE2MjY0Myw2MTI3ODAwMzQsMTE1NDM4NTYxOSw2MDU5MzM1MSw0MTE2MDU5NTFdLCJ2IjoxfQ.5cd6792ea817

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Answer key · Evaluate algebraic expressions involving decimal numbers

1.
8.9 — 2.4 × 3 = 7.2, then + 1.7 = 8.9.
2.
6.5 — 1.9 × 2 = 3.8, then + 2.7 = 6.5.
3.
18 — 2.1 × 8 = 16.8, then + 1.2 = 18.
4.
8.7 — 1.3 × 7 = 9.1, then − 0.4 = 8.7.
5.
12.7 — 2.1 × 9 = 18.9, then − 6.2 = 12.7.
6.
1.7 — 1.7 × 4 = 6.8, then − 5.1 = 1.7.
7.
14.4 — 2.1 × 2 = 4.2 and 1.7 × 6 = 10.2, so the sum is 14.4.
8.
19.5 — 2.3 × 3 = 6.9 and 2.1 × 6 = 12.6, so the sum is 19.5.
9.
27 — 2.1 × 6 = 12.6 and 2.4 × 6 = 14.4, so the sum is 27.