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Integer

https://www.ixl.com/math/grade-8/add-and-subtract-three-or-more-integers
https://www.ixl.com/math/grade-8/evaluate-numerical-expressions-involving-integers
https://www.ixl.com/math/grade-7/integers-on-number-lines
https://www.ixl.com/math/grade-7/compare-and-order-integers
https://www.ixl.com/math/grade-7/add-integers
https://www.ixl.com/math/grade-7/add-three-or-more-integers
https://www.ixl.com/math/grade-7/add-and-subtract-integers

Expressions and Sequences

Place Value and Rounding

https://www.ixl.com/math/grade-8/add-and-subtract-linear-expressions
https://www.ixl.com/math/grade-8/solve-equations-with-variables-on-both-sides
https://www.ixl.com/math/grade-7/solve-two-step-equations-with-parentheses
https://www.ixl.com/math/grade-3/place-value-word-problems
https://www.ixl.com/math/grade-2/convert-between-place-values-ones-and-hundreds

Decimals

https://www.ixl.com/math/grade-7/decimal-numbers-review
https://www.ixl.com/math/grade-7/compare-and-order-decimals

Fractions

https://www.ixl.com/math/grade-7/add-and-subtract-mixed-numbers-word-problems
https://www.ixl.com/math/grade-7/inequalities-with-addition-and-subtraction-of-fractions-and-mixed-numbers
https://www.ixl.com/math/grade-7/multiply-fractions-and-whole-numbers
https://www.ixl.com/math/grade-7/multiply-fractions
https://www.ixl.com/math/grade-7/multiply-mixed-numbers
https://www.ixl.com/math/grade-7/multiply-fractions-and-mixed-numbers-word-problems
https://www.ixl.com/math/grade-7/divide-fractions
https://www.ixl.com/math/grade-7/divide-mixed-numbers
https://www.ixl.com/math/grade-7/divide-fractions-and-mixed-numbers-word-problems
https://www.ixl.com/math/grade-7/add-subtract-multiply-and-divide-fractions-and-mixed-numbers-word-problems