This pictorial notation is not algebraic, but Lala's description and reasoning are; she can simplify the equation by taking away equal unknowns on both sides of the

equal sign to isolate the grey unknown.

In relation to the discussion of mathematical power and thinking, this use of the

equal sign (=) reinscribed a truth by which to establish equality, as a form of universal logic.

Due to these experiences, students often view the

equal sign as the symbol that precedes the answer or as an indicator to compute what is to its left.

CAL intervention was divided into six units: (a)

equal sign as a relational term, (b) addition concepts and operational strategies for problems for which retrieval is a viable strategy (problems where both operands are one digit or one operand is one digit and the other is two digits but regrouping is not required), (c) concepts and operational strategies for similar problems involving subtraction, (d) concepts and operational strategies for addition problems with regrouping, (e) concepts and operational strategies for subtraction problems with regrouping, and (f) review (although cumulative review was also integrated throughout the first five units).

It has been well-documented that many students do not understand the meaning of the

equal sign (Carpenter et al., 2003; Faulkner, Levi, & Carpenter, 1999; Knuth, Alibali, Hattikudur, McNeil, & Stephens, 2008; Knuth, Stephens, McNeil, & Alibali, 2006; Molina & Ambrose, 2006).

6) Basic Skill 6 - Use Self-defined Formula (Other self-defined formulas can also be developed by typing appropriate mathematic expression after the

equal sign "=").

Enter an

equal sign to begin a function and point to the cell in the PivotTable containing Allen Pearson's total sales to Commercial customers, 326 (cell H6 on the PivotOne worksheet in Exhibit 3)).

Such a law could aid millions of low-paid workers (at Wal-Mart-like chains, for example) who'd seem to merit a lot more sympathy and special government backing than firefighters sporting "Fire Cicilline" and "Cicilline (

equal sign) DemoRat" signs across the street from a meeting of America's mayors.

EQUAL SIGN 'You don't get progress if there isn't a bit of a push forward', according to Harriet Harman

We focus on developing relational thinking through the understanding of the

equal sign, the use of number relations to solve problems, conjecture, and justify (Carpenter et al., 2003).

where [[alpha].sub.s] = [[SIGMA].sup.k.sub.i=1] [[beta].sub.is], s = 1,2, ..., r, but in this case, two

equal sign in the above can't be hold