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

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1
Evaluate 1.5 × n + 0.3 when n = 7.
Warm-up
Answer:
2
Evaluate 2.2 × n + 3 when n = 5.
Warm-up
Answer:
3
Evaluate 2.2 × n + 1.5 when n = 3.
Warm-up
Answer:
4
Evaluate 2.4 × n − 17.2 when n = 8.
On level
Answer:
5
Evaluate 2.3 × n − 17.9 when n = 8.
On level
Answer:
6
Evaluate 1.3 × n − 1.4 when n = 6.
On level
Answer:
7
Evaluate 2.2 × a + 1.9 × b when a = 3 and b = 6.
Challenge
Answer:
8
Evaluate 1.4 × a + 2.2 × b when a = 3 and b = 3.
Challenge
Answer:
9
Evaluate 2.3 × a + 2.1 × b when a = 6 and b = 5.
Challenge
Answer:

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Worksheet code: eyJzIjoiYWxnZWJyYS1ldmFsdWF0ZS1leHByLWRlY2ltYWwiLCJkIjpbMTMxNzEwMzUsMTU2MDQzODE4NSwxMjU5MDkzODA0LDE1NDk2NDAzMzksMjAxMjkwNDg5Niw2NjUxNDgxODMsMTU0MzMyMzY3MCwxNzQwNjExMzgyLDkxNjU1Mzc0OV0sInYiOjF9.975d5612ae03

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Answer key · Evaluate algebraic expressions involving decimal numbers

1.
10.8 — 1.5 × 7 = 10.5, then + 0.3 = 10.8.
2.
14 — 2.2 × 5 = 11, then + 3 = 14.
3.
8.1 — 2.2 × 3 = 6.6, then + 1.5 = 8.1.
4.
2 — 2.4 × 8 = 19.2, then − 17.2 = 2.
5.
0.5 — 2.3 × 8 = 18.4, then − 17.9 = 0.5.
6.
6.4 — 1.3 × 6 = 7.8, then − 1.4 = 6.4.
7.
18 — 2.2 × 3 = 6.6 and 1.9 × 6 = 11.4, so the sum is 18.
8.
10.8 — 1.4 × 3 = 4.2 and 2.2 × 3 = 6.6, so the sum is 10.8.
9.
24.3 — 2.3 × 6 = 13.8 and 2.1 × 5 = 10.5, so the sum is 24.3.