Reteach and Skills Practice Workbook

6–4
Name
Reteach
Solve Equations Mentally
Date
Sometimes in math it helps to think about what the problem is asking
you to do. 7 × c = 28
In 7 × c = 28, you can ask, “7 times what number equals 28?”
You might know that 7 × 4 = 28, so you know that 4 is the correct
answer.
4AF1.0
Chapter Resources
If you do not know the answer right away, you can try a few answers that
you do know: “I know 7 × 2 = 14. 14 is less than 28, so I need to try
something bigger.” You can try this a few times to find the correct answer.
You can think about division problems the same way. In 35 ÷ f = 5, “35
divided by what number equals 5?” You might know that 35 ÷ 7 = 5,
so you know that 7 is the correct answer.
If you do not know the answer right away, you can try a few answers
that you do know: “I know that 35 ÷ 5 = 7. 7 is greater than 5, so I
need to try something bigger.”
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Write out each equation in words. The first problem has been
done for you.
1. 2 × v = 18 2 times what number equals 18?
2. x × 7 = 42
3. 8 × p = 64
4. 9 × y = 63
5. g ÷ 6 = 9
6. 35 ÷ j = 7
7. 45 ÷ h = 9
8. s ÷ 12 = 8
Write the missing number.
9. × 8 = 48 12. 5 × = 15 15. × 3 = 27
10. 60 ÷ = 12 13. ÷ 5 = 10 16. 2 × = 22
11. × 6 = 54 14. 77 ÷ = 11 17. 81 ÷ = 9
Grade 4 105 Chapter 6